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	diff --git a/doc/developer_manual/.gitignore b/doc/developer_manual/.gitignore
	new file mode 100644
	index 0000000..ee6b554
	--- /dev/null
	+++ b/doc/developer_manual/.gitignore
	@@ -0,0 +1,3 @@
	+developer_manual.*
	+!developer_manual.tex
	+build/
	diff --git a/doc/developer_manual/JHEP.bst b/doc/developer_manual/JHEP.bst
	new file mode 100644
	index 0000000..de998be
	--- /dev/null
	+++ b/doc/developer_manual/JHEP.bst
	@@ -0,0 +1,1104 @@
	+% JHEP bibliography style ver. 2.1
	+%
	+% The bibtex output produced by inSPIRE, while far from perfect, is pretty
	+% suitable for use with this style. Indeed, this style was designed with
	+% inSPIRE in mind.
	+%
	+%
	+%
	+% Copyright 2015 SISSA Medialab
	+%
	+% This work may be distributed and/or modified under the
	+% conditions of the LaTeX Project Public License, either version 1.3
	+% of this license or (at your option) any later version.
	+% The latest version of this license is in
	+% http://www.latex-project.org/lppl.txt
	+% and version 1.3 or later is part of all distributions of LaTeX
	+% version 2005/12/01 or later.
	+%
	+% This work has the LPPL maintenance status `author-maintained'.
	+%
	+% The Current Maintainer of this work is
	+% SISSA Medialab <info@medialab.sissa.it>
	+%
	+% This work consists of the file JHEP.bst.
	+
	+
	+ENTRY
	+ { address
	+ author
	+ booktitle
	+ chapter
	+ edition
	+ editor
	+ howpublished
	+ institution
	+ journal
	+ key
	+ month
	+ note
	+ number
	+ organization
	+ pages
	+ publisher
	+ school
	+ series
	+ title
	+ doi
	+ SLACcitation
	+ type
	+ volume
	+ year
	+ archive
	+ eprint
	+ report
	+ collaboration
	+ }
	+ {}
	+ { label }
	+
	+INTEGERS { output.state before.all mid.sentence after.quote after.sentence
	+ after.quoted.block after.block }
	+
	+FUNCTION {init.state.consts}
	+{ #0 'before.all :=
	+ #1 'mid.sentence :=
	+ #2 'after.quote :=
	+ #3 'after.sentence :=
	+ #4 'after.quoted.block :=
	+ #5 'after.block :=
	+}
	+
	+STRINGS { s t ref }
	+
	+FUNCTION {output.nonnull}
	+{ 's :=
	+ output.state mid.sentence =
	+ { ", " * write$ }
	+ { output.state after.quote =
	+ { " " * write$ }
	+ { output.state after.block =
	+ { add.period$ write$
	+ newline$
	+ "\newblock " write$
	+ }
	+ { output.state before.all =
	+ 'write$
	+ { output.state after.quoted.block =
	+ { write$
	+ newline$
	+ "\newblock " write$
	+ }
	+ { add.period$ " " * write$ }
	+ if$
	+ }
	+ if$
	+ }
	+ if$
	+ }
	+ if$
	+ mid.sentence 'output.state :=
	+ }
	+ if$
	+ s
	+}
	+
	+FUNCTION {output}
	+{ duplicate$ empty$
	+ 'pop$
	+ 'output.nonnull
	+ if$
	+}
	+
	+FUNCTION {output.check}
	+{ 't :=
	+ duplicate$ empty$
	+ { pop$ "empty " t * " in " * cite$ * warning$ }
	+ 'output.nonnull
	+ if$
	+}
	+
	+FUNCTION {output.bibitem}
	+{ newline$
	+ "\bibitem{" write$
	+ cite$ write$
	+ "}" write$
	+ newline$
	+ ""
	+ before.all 'output.state :=
	+}
	+
	+FUNCTION {blank.sep}
	+{ after.quote 'output.state :=
	+}
	+
	+
	+
	+FUNCTION {fin.entry}
	+{ output.state after.quoted.block =
	+ 'skip$
	+ 'add.period$
	+ if$
	+ write$
	+ newline$
	+}
	+
	+FUNCTION {new.block}
	+{ output.state before.all =
	+ 'skip$
	+ { output.state after.quote =
	+ { after.quoted.block 'output.state := }
	+ { after.block 'output.state := }
	+ if$
	+ }
	+ if$
	+}
	+
	+FUNCTION {new.sentence}
	+{ output.state after.block =
	+ 'skip$
	+ { output.state before.all =
	+ 'skip$
	+ { after.sentence 'output.state := }
	+ if$
	+ }
	+ if$
	+}
	+
	+FUNCTION {not}
	+{ { #0 }
	+ { #1 }
	+ if$
	+}
	+
	+FUNCTION {and}
	+{ 'skip$
	+ { pop$ #0 }
	+ if$
	+}
	+
	+FUNCTION {or}
	+{ { pop$ #1 }
	+ 'skip$
	+ if$
	+}
	+
	+FUNCTION {new.block.checka}
	+{ empty$
	+ 'skip$
	+ 'new.block
	+ if$
	+}
	+
	+FUNCTION {new.block.checkb}
	+{ empty$
	+ swap$ empty$
	+ and
	+ 'skip$
	+ 'new.block
	+ if$
	+}
	+
	+FUNCTION {new.sentence.checka}
	+{ empty$
	+ 'skip$
	+ 'new.sentence
	+ if$
	+}
	+
	+FUNCTION {field.or.null}
	+{ duplicate$ empty$
	+ { pop$ "" }
	+ 'skip$
	+ if$
	+}
	+
	+FUNCTION {emphasize}
	+{ duplicate$ empty$
	+ { pop$ "" }
	+ { "\emph{" swap$ * "}" * }
	+ if$
	+}
	+
	+%% this functions should append the correct url prefix to doi
	+FUNCTION {format.doi}
	+{ doi empty$
	+ { "" }
	+ {"\href{http://dx.doi.org/" doi * "}" * }
	+ if$
	+}
	+
	+FUNCTION {formatfull.doi}
	+{ doi empty$
	+ { "" }
	+ {"\href{http://dx.doi.org/" doi *
	+ "}{DOI}" * }
	+ if$
	+}
	+
	+
	+INTEGERS { nameptr namesleft numnames }
	+
	+FUNCTION {format.names}
	+{ 's :=
	+ #1 'nameptr :=
	+ s num.names$ 'numnames :=
	+ numnames 'namesleft :=
	+ { namesleft #0 > }
	+ { s nameptr "{f.~}{vv~}{ll}{, jj}" format.name$ 't :=
	+ nameptr #1 >
	+ { namesleft #1 >
	+ { ", " * t * }
	+ { numnames #2 >
	+ { "" * }
	+ 'skip$
	+ if$
	+ t "others" =
	+ { " et~al." * }
	+ { " and " * t * }
	+ if$
	+ }
	+ if$
	+ }
	+ nameptr #6 >
	+ { #0 'namesleft :=
	+ "others" 't :=
	+ 't
	+ }
	+ {'t}
	+ if$
	+ if$
	+ nameptr #1 + 'nameptr :=
	+ namesleft #1 - 'namesleft :=
	+ }
	+ while$
	+}
	+
	+
	+FUNCTION {format.authors}
	+{ author empty$
	+ { "" }
	+ { author format.names }
	+ if$
	+}
	+
	+FUNCTION {format.eprint}
	+{ eprint empty$
	+ { ""}
	+ { archive empty$
	+ {"\href{http://arxiv.org/abs/" eprint * "}" *
	+ "{{\tt " * eprint * "}}" *}
	+ {"\href{http://arxiv.org/abs/" archive * "/" * eprint * "}" *
	+ "{{\tt " * archive * "/" * eprint * "}}" *}
	+ if$
	+ }
	+ if$
	+}
	+
	+FUNCTION {format.eprint.paren}
	+{ eprint missing$ { "" } { eprint empty$ { "" }
	+ {"[" format.eprint * "]" *}
	+ if$
	+ }
	+ if$
	+}
	+
	+
	+
	+FUNCTION {format.report}
	+{ report empty$
	+ { ""}
	+ { report}
	+ if$
	+}
	+
	+
	+
	+FUNCTION {format.editors}
	+{ editor empty$
	+ { "" }
	+ { editor format.names
	+ editor num.names$ #1 >
	+ { ", eds." * }
	+ { ", ed." * }
	+ if$
	+ }
	+ if$
	+}
	+
	+FUNCTION {format.title}
	+{ title empty$
	+ { "" }
	+ { "\emph{" title "t" change.case$ * "}, " * }
	+ if$
	+}
	+
	+FUNCTION {format.title.p}
	+{ title empty$
	+ { "" }
	+ { "``" title "t" change.case$ * ".''" * }
	+ if$
	+}
	+
	+FUNCTION {n.dashify}
	+{ 't :=
	+ ""
	+ { t empty$ not }
	+ { t #1 #1 substring$ "-" =
	+ { t #1 #2 substring$ "--" = not
	+ { "--" *
	+ t #2 global.max$ substring$ 't :=
	+ }
	+ { { t #1 #1 substring$ "-" = }
	+ { "-" *
	+ t #2 global.max$ substring$ 't :=
	+ }
	+ while$
	+ }
	+ if$
	+ }
	+ { t #1 #1 substring$ *
	+ t #2 global.max$ substring$ 't :=
	+ }
	+ if$
	+ }
	+ while$
	+}
	+
	+FUNCTION {format.date}
	+{ year empty$
	+ { month empty$
	+ { "" }
	+ { "there's a month but no year in " cite$ * warning$
	+ month
	+ }
	+ if$
	+ }
	+ { month empty$
	+ 'year
	+ { month ", " * year * }
	+ if$
	+ }
	+ if$
	+}
	+
	+FUNCTION {format.date.paren}
	+{ year empty$
	+ { month empty$
	+ { "" }
	+ { "there's a month but no year in " cite$ * warning$
	+ month
	+ }
	+ if$
	+ }
	+ { month empty$
	+ {"(" year * ")" *}
	+ {"(" month * ", " * year * ")" *}
	+ if$
	+ }
	+ if$
	+}
	+
	+FUNCTION {format.collaboration}
	+{ collaboration empty$
	+ { "" }
	+ { "{\scshape " collaboration * "} " * "collaboration" * }
	+ if$
	+}
	+
	+
	+FUNCTION {format.btitle}
	+{ title emphasize
	+}
	+
	+FUNCTION {tie.or.space.connect}
	+{ duplicate$ text.length$ #3 <
	+ { "~" }
	+ { " " }
	+ if$
	+ swap$ * *
	+}
	+
	+FUNCTION {either.or.check}
	+{ empty$
	+ 'pop$
	+ { "can't use both " swap$ * " fields in " * cite$ * warning$ }
	+ if$
	+}
	+
	+FUNCTION {format.bvolume}
	+{ volume empty$
	+ { "" }
	+ { "vol.~" volume *
	+ series empty$
	+ 'skip$
	+ { " of " * series emphasize * }
	+ if$
	+ "volume and number" number either.or.check
	+ }
	+ if$
	+}
	+
	+FUNCTION {format.number.series}
	+{ volume empty$
	+ { number empty$
	+ { series field.or.null }
	+ { output.state mid.sentence =
	+ { "no.~" }
	+ { "No.~" }
	+ if$
	+ number *
	+ series empty$
	+ { "there's a number but no series in " cite$ * warning$ }
	+ { " in " * series * }
	+ if$
	+ }
	+ if$
	+ }
	+ { "" }
	+ if$
	+}
	+
	+FUNCTION {format.edition}
	+{ edition empty$
	+ { "" }
	+ { edition "l" change.case$ "~ed." * }
	+ if$
	+}
	+
	+INTEGERS { multiresult }
	+
	+FUNCTION {multi.page.check}
	+{ 't :=
	+ #0 'multiresult :=
	+ { multiresult not
	+ t empty$ not
	+ and
	+ }
	+ { t #1 #1 substring$
	+ duplicate$ "-" =
	+ swap$ duplicate$ "," =
	+ swap$ "+" =
	+ or or
	+ { #1 'multiresult := }
	+ { t #2 global.max$ substring$ 't := }
	+ if$
	+ }
	+ while$
	+ multiresult
	+}
	+
	+FUNCTION {format.pages}
	+{ pages empty$
	+ { "" }
	+ { pages multi.page.check
	+ { "pp.~" pages n.dashify * }
	+ { "p.~" pages * }
	+ if$
	+ }
	+ if$
	+}
	+
	+FUNCTION {format.pages.nopp}
	+{ pages empty$
	+ { "" }
	+ { pages multi.page.check
	+ { pages n.dashify }
	+ { pages }
	+ if$
	+ }
	+ if$
	+}
	+
	+
	+FUNCTION {format.volume}
	+{ volume empty$
	+ { "" }
	+ { "{\bf " volume * "}" * }
	+ if$
	+}
	+
	+FUNCTION {format.number}
	+{ number empty$
	+ { "" }
	+ { "no.~" number * }
	+ if$
	+}
	+
	+FUNCTION {format.chapter.pages}
	+{ chapter empty$
	+ 'format.pages
	+ { type empty$
	+ { "ch.~" chapter * }
	+ { type "l" change.case$ chapter tie.or.space.connect }
	+ if$
	+ pages empty$
	+ 'skip$
	+ { ", " * format.pages * }
	+ if$
	+ }
	+ if$
	+}
	+
	+FUNCTION {format.in.ed.booktitle}
	+{ booktitle empty$
	+ { "" }
	+ { "in " booktitle emphasize *
	+ editor empty$
	+ 'skip$
	+ { " (" * format.editors * ")" * }
	+ if$
	+ }
	+ if$
	+}
	+
	+FUNCTION {format.thesis.type}
	+{ type empty$
	+ 'skip$
	+ { pop$
	+ output.state after.block =
	+ { type "t" change.case$ }
	+ { type "l" change.case$ }
	+ if$
	+ }
	+ if$
	+}
	+
	+FUNCTION {empty.misc.check}
	+{ author empty$ title empty$ howpublished empty$
	+ month empty$ year empty$ note empty$
	+ and and and and and
	+ { "all relevant fields are empty in " cite$ * warning$ }
	+ 'skip$
	+ if$
	+}
	+
	+FUNCTION {format.tr.number}
	+{ type empty$
	+ { "Tech. Rep." }
	+ 'type
	+ if$
	+ number empty$
	+ { "l" change.case$ }
	+ { number tie.or.space.connect }
	+ if$
	+}
	+
	+FUNCTION {format.paddress}
	+{ address empty$
	+ { "" }
	+ { "(" address * ")" * }
	+ if$
	+}
	+
	+FUNCTION {format.article.crossref}
	+{ key empty$
	+ { journal empty$
	+ { "need key or journal for " cite$ * " to crossref " * crossref *
	+ warning$
	+ ""
	+ }
	+ { "in \emph{" journal * "\/}" * }
	+ if$
	+ }
	+ { "in " key * }
	+ if$
	+ " \cite{" * crossref * "}" *
	+}
	+
	+FUNCTION {format.crossref.editor}
	+{ editor #1 "{vv~}{ll}" format.name$
	+ editor num.names$ duplicate$
	+ #2 >
	+ { pop$ " {et~al.}" * }
	+ { #2 <
	+ 'skip$
	+ { editor #2 "{ff }{vv }{ll}{ jj}" format.name$ "others" =
	+ { " {et~al.}" * }
	+ { " and " * editor #2 "{vv~}{ll}" format.name$ * }
	+ if$
	+ }
	+ if$
	+ }
	+ if$
	+}
	+
	+FUNCTION {format.book.crossref}
	+{ volume empty$
	+ { "empty volume in " cite$ * "'s crossref of " * crossref * warning$
	+ "In "
	+ }
	+ { "Vol.~" volume *
	+ " of " *
	+ }
	+ if$
	+ editor empty$
	+ editor field.or.null author field.or.null =
	+ or
	+ { key empty$
	+ { series empty$
	+ { "need editor, key, or series for " cite$ * " to crossref " *
	+ crossref * warning$
	+ "" *
	+ }
	+ { "{\em " * series * "\/}" * }
	+ if$
	+ }
	+ { key * }
	+ if$
	+ }
	+ { format.crossref.editor * }
	+ if$
	+ " \cite{" * crossref * "}" *
	+}
	+
	+FUNCTION {format.incoll.inproc.crossref}
	+{ editor empty$
	+ editor field.or.null author field.or.null =
	+ or
	+ { key empty$
	+ { booktitle empty$
	+ { "need editor, key, or booktitle for " cite$ * " to crossref " *
	+ crossref * warning$
	+ ""
	+ }
	+ { "in {\em " booktitle * "\/}" * }
	+ if$
	+ }
	+ { "in " key * }
	+ if$
	+ }
	+ { "in " format.crossref.editor * }
	+ if$
	+ " \cite{" * crossref * "}" *
	+}
	+
	+FUNCTION {article}
	+{ output.bibitem
	+ format.collaboration output
	+ format.authors "author" output.check
	+ format.title "title" output.check
	+ blank.sep
	+ crossref missing$
	+ { journal missing$
	+ { format.eprint output }
	+ { journal empty$ { format.eprint output } {
	+ format.doi * "{" * journal emphasize before.all 'output.state := "journal" output.check
	+ % added \href{doi} and { before journal
	+ % Slv
	+ blank.sep
	+ format.volume output
	+ blank.sep
	+ format.date.paren "year" output.check
	+ %month empty$ { format.number output }
	+ % 'skip$ if$
	+ blank.sep
	+ format.pages.nopp "}" * output }
	+ %% closed parenthesis for href argument
	+ if$
	+ }
	+ if$
	+ report missing$
	+ { journal empty$ {} { format.eprint.paren output} if$ }
	+ {blank.sep format.report output format.eprint.paren output}
	+ if$
	+ }
	+ { format.article.crossref output.nonnull
	+ format.pages output
	+ format.eprint.paren output
	+ }
	+ if$
	+ new.sentence
	+ % format.doi output
	+ % note output
	+ fin.entry
	+}
	+
	+FUNCTION {book}
	+{ output.bibitem
	+ format.collaboration output
	+ author empty$
	+ { format.editors "author and editor" output.check }
	+ { format.authors output.nonnull
	+ crossref missing$
	+ { "author and editor" editor either.or.check }
	+ 'skip$
	+ if$
	+ }
	+ if$
	+ format.btitle "title" output.check
	+ crossref missing$
	+ { format.bvolume output
	+ new.block
	+ format.number.series output
	+ new.sentence
	+ publisher "publisher" output.check
	+ address output
	+ }
	+ { new.block
	+ format.book.crossref output.nonnull
	+ }
	+ if$
	+ format.edition output
	+ format.date "year" output.check
	+ doi empty$
	+ {}
	+ { format.doi "{" * doi * "}" * "DOI" output.check }
	+ if$
	+ fin.entry
	+}
	+
	+FUNCTION {booklet}
	+{ output.bibitem
	+ format.collaboration output
	+ format.authors output
	+ title empty$
	+ { "empty title in " cite$ * warning$
	+ howpublished new.sentence.checka
	+ }
	+ { howpublished empty$ not
	+ address empty$ month empty$ year empty$ and and
	+ or
	+ { format.title.p output.nonnull }
	+ { format.title output.nonnull }
	+ if$
	+ blank.sep
	+ }
	+ if$
	+ howpublished output
	+ address output
	+ format.date output
	+ new.block
	+ % note output
	+ doi output
	+ fin.entry
	+}
	+
	+FUNCTION {inbook}
	+{ output.bibitem
	+ format.collaboration output
	+ author empty$
	+ { format.editors "author and editor" output.check }
	+ { format.authors output.nonnull
	+ crossref missing$
	+ { "author and editor" editor either.or.check }
	+ 'skip$
	+ if$
	+ }
	+ if$
	+ format.btitle "title" output.check
	+ crossref missing$
	+ { format.bvolume output
	+ format.chapter.pages "chapter and pages" output.check
	+ new.block
	+ format.number.series output
	+ new.block
	+ publisher "publisher" output.check
	+ address output
	+ }
	+ { format.chapter.pages "chapter and pages" output.check
	+ new.block
	+ format.book.crossref output.nonnull
	+ }
	+ if$
	+ format.edition output
	+ format.date "year" output.check
	+ new.block
	+ format.eprint output
	+ new.block
	+ % note output
	+ doi output
	+ fin.entry
	+}
	+
	+FUNCTION {incollection}
	+{ output.bibitem
	+ format.collaboration output
	+ format.authors "author" output.check
	+ format.title "title" output.check
	+ blank.sep
	+ crossref missing$
	+ { format.in.ed.booktitle "booktitle" output.check
	+ format.bvolume output
	+ format.number.series output
	+ format.chapter.pages output
	+ new.block
	+ publisher "publisher" output.check
	+ address output
	+ format.edition output
	+ format.date "year" output.check
	+ }
	+ { format.incoll.inproc.crossref output.nonnull
	+ format.chapter.pages output
	+ }
	+ if$
	+ new.block
	+ format.eprint output
	+ new.block
	+ % note output
	+ formatfull.doi output
	+ fin.entry
	+}
	+
	+FUNCTION {inproceedings}
	+{ output.bibitem
	+ format.collaboration output
	+ format.authors "author" output.check
	+ format.title "title" output.check
	+ blank.sep
	+ crossref missing$
	+ { format.in.ed.booktitle "booktitle" output.check
	+ format.bvolume output
	+ format.number.series output
	+ format.paddress output
	+ format.pages output
	+ organization output
	+ publisher output
	+ format.date "year" output.check
	+ }
	+ { format.incoll.inproc.crossref output.nonnull
	+ format.pages output
	+ }
	+ if$
	+ new.block
	+ format.eprint output
	+ new.block
	+ % note output
	+ formatfull.doi output
	+ fin.entry
	+}
	+
	+FUNCTION {conference} { inproceedings }
	+
	+FUNCTION {manual}
	+{ output.bibitem
	+ format.collaboration output
	+ author empty$
	+ { organization empty$
	+ 'skip$
	+ { organization output.nonnull
	+ address output
	+ }
	+ if$
	+ }
	+ { format.authors output.nonnull }
	+ if$
	+ format.btitle "title" output.check
	+ author empty$
	+ { organization empty$
	+ { address new.block.checka
	+ address output
	+ }
	+ 'skip$
	+ if$
	+ }
	+ { organization address new.block.checkb
	+ organization output
	+ address output
	+ }
	+ if$
	+ format.edition output
	+ format.date output
	+ new.block
	+ % note output
	+ doi output
	+ fin.entry
	+}
	+
	+FUNCTION {electronic} { manual }
	+
	+FUNCTION {mastersthesis}
	+{ output.bibitem
	+ format.authors "author" output.check
	+ format.title "title" output.check
	+ blank.sep
	+ "Master's thesis" format.thesis.type output.nonnull
	+ school "school" output.check
	+ address output
	+ format.date "year" output.check
	+ new.block
	+ % note output
	+ doi output
	+ fin.entry
	+}
	+
	+FUNCTION {misc}
	+{ output.bibitem
	+ format.collaboration output
	+ format.authors output
	+ title empty$
	+ { howpublished new.sentence.checka }
	+ { howpublished empty$ not
	+ month empty$ year empty$ and
	+ or
	+ { format.title.p output.nonnull }
	+ { format.title output.nonnull }
	+ if$
	+ blank.sep
	+ }
	+ if$
	+ howpublished output
	+ format.date output
	+ new.block
	+ % note output
	+ doi output
	+ fin.entry
	+ empty.misc.check
	+}
	+
	+FUNCTION {phdthesis}
	+{ output.bibitem
	+ format.authors "author" output.check
	+ format.btitle "title" output.check
	+ new.block
	+ "PhD thesis" format.thesis.type output.nonnull
	+ school "school" output.check
	+ address output
	+ format.date "year" output.check
	+ new.block
	+ format.eprint output
	+ new.block
	+ % note output
	+ doi output
	+ fin.entry
	+}
	+
	+FUNCTION {proceedings}
	+{ output.bibitem
	+ editor empty$
	+ { organization output }
	+ { format.editors output.nonnull }
	+ if$
	+ format.btitle "title" output.check
	+ format.bvolume output
	+ format.number.series output
	+ format.paddress output
	+ editor empty$
	+ 'skip$
	+ { organization output }
	+ if$
	+ publisher output
	+ format.date "year" output.check
	+ new.block
	+ % note output
	+ doi output
	+ fin.entry
	+}
	+
	+FUNCTION {techreport}
	+{ output.bibitem
	+ format.collaboration output
	+ format.authors "author" output.check
	+ format.title "title" output.check
	+ blank.sep
	+ format.tr.number output.nonnull
	+ institution "institution" output.check
	+ address output
	+ format.date "year" output.check
	+ new.block
	+ % note output
	+ doi output
	+ fin.entry
	+}
	+
	+FUNCTION {unpublished}
	+{ output.bibitem
	+ format.collaboration output
	+ format.authors "author" output.check
	+ format.title.p "title" output.check
	+ blank.sep
	+ % note "note" output.check
	+ format.date output
	+ fin.entry
	+}
	+
	+FUNCTION {default.type} { misc }
	+
	+MACRO {jan} {"Jan."}
	+
	+MACRO {feb} {"Feb."}
	+
	+MACRO {mar} {"Mar."}
	+
	+MACRO {apr} {"Apr."}
	+
	+MACRO {may} {"May"}
	+
	+MACRO {jun} {"June"}
	+
	+MACRO {jul} {"July"}
	+
	+MACRO {aug} {"Aug."}
	+
	+MACRO {sep} {"Sept."}
	+
	+MACRO {oct} {"Oct."}
	+
	+MACRO {nov} {"Nov."}
	+
	+MACRO {dec} {"Dec."}
	+
	+MACRO {nup} {"Nucl. Phys."}
	+
	+MACRO {cmp} {"Comm. Math. Phys."}
	+
	+MACRO {prl} {"Phys. Rev. Lett."}
	+
	+MACRO {pl} {"Phys. Lett."}
	+
	+MACRO {rmp} {"Rev. Mod. Phys."}
	+
	+MACRO {ijmp} {"Int. Jour. Mod. Phys."}
	+
	+MACRO {mpl} {"Mod. Phys. Lett."}
	+
	+MACRO {pr} {"Phys. Rev."}
	+
	+READ
	+
	+STRINGS { longest.label }
	+
	+INTEGERS { number.label longest.label.width }
	+
	+FUNCTION {initialize.longest.label}
	+{ "" 'longest.label :=
	+ #1 'number.label :=
	+ #0 'longest.label.width :=
	+}
	+
	+FUNCTION {longest.label.pass}
	+{ number.label int.to.str$ 'label :=
	+ number.label #1 + 'number.label :=
	+ label width$ longest.label.width >
	+ { label 'longest.label :=
	+ label width$ 'longest.label.width :=
	+ }
	+ 'skip$
	+ if$
	+}
	+
	+EXECUTE {initialize.longest.label}
	+
	+ITERATE {longest.label.pass}
	+
	+FUNCTION {begin.bib}
	+{ preamble$ empty$
	+ 'skip$
	+ { preamble$ write$ newline$ }
	+ if$
	+ "\providecommand{\href}[2]{#2}"
	+ "\begingroup\raggedright\begin{thebibliography}{" * longest.label *
	+ "}" * write$ newline$ }
	+
	+EXECUTE {begin.bib}
	+
	+EXECUTE {init.state.consts}
	+
	+ITERATE {call.type$}
	+
	+FUNCTION {end.bib}
	+{ newline$
	+ "\end{thebibliography}\endgroup" write$ newline$
	+}
	+
	+EXECUTE {end.bib}
	diff --git a/doc/developer_manual/Makefile b/doc/developer_manual/Makefile
	new file mode 100644
	index 0000000..67920f8
	--- /dev/null
	+++ b/doc/developer_manual/Makefile
	@@ -0,0 +1,22 @@
	+SHELL=/bin/bash
	+
	+SRCFILES=$(wildcard src/*.asy)
	+FIGURES=$(patsubst src/%.asy,build/figures/%.pdf,$(SRCFILES))
	+
	+.SECONDARY:
	+
	+.SUFFIXES:
	+
	+developer_manual.pdf: developer_manual.tex $(FIGURES)
	+ latexmk -pdf -pdflatex='pdflatex -synctex=1' $<
	+
	+build/figures/%.pdf: src/%.asy
	+ mkdir -p $(@D)
	+ asy -f pdf -o $@ $<
	+
	+.PHONY: clean
	+
	+clean:
	+ rm -f developer_manual.{pdf,aux,dvi,fdb_latexmk,fls,nav,out,snm,synctex.gz,toc,vrb}
	+ rm -f *.log
	+ rm -fr build
	diff --git a/doc/developer_manual/biblio.bib b/doc/developer_manual/biblio.bib
	new file mode 100644
	index 0000000..771d819
	--- /dev/null
	+++ b/doc/developer_manual/biblio.bib
	@@ -0,0 +1,60 @@
	+@Article{Andersen:2008gc,
	+ author = "Andersen, Jeppe R. and Del Duca, Vittorio and White, Chris
	+ D.",
	+ title = "{Higgs Boson Production in Association with Multiple Hard
	+ Jets}",
	+ journal = "JHEP",
	+ volume = "02",
	+ year = "2009",
	+ pages = "015",
	+ eprint = "0808.3696",
	+ archivePrefix = "arXiv",
	+ primaryClass = "hep-ph",
	+ doi = "10.1088/1126-6708/2009/02/015",
	+ SLACcitation = "%%CITATION = 0808.3696;%%"
	+}
	+
	+@Article{Andersen:2008ue,
	+ author = "Andersen, Jeppe R. and White, Chris D.",
	+ title = "{A New Framework for Multijet Predictions and its
	+ application to Higgs Boson production at the LHC}",
	+ journal = "Phys. Rev.",
	+ volume = "D78",
	+ year = "2008",
	+ pages = "051501",
	+ eprint = "0802.2858",
	+ archivePrefix = "arXiv",
	+ primaryClass = "hep-ph",
	+ doi = "10.1103/PhysRevD.78.051501",
	+ SLACcitation = "%%CITATION = 0802.2858;%%"
	+}
	+@article{Alwall:2006yp,
	+ author = "Alwall, Johan and others",
	+ title = "{A Standard format for Les Houches event files}",
	+ booktitle = "{Monte Carlos for the LHC: A Workshop on the Tools for
	+ LHC Event Simulation (MC4LHC) Geneva, Switzerland, July
	+ 17-16, 2006}",
	+ journal = "Comput. Phys. Commun.",
	+ volume = "176",
	+ year = "2007",
	+ pages = "300-304",
	+ doi = "10.1016/j.cpc.2006.11.010",
	+ eprint = "hep-ph/0609017",
	+ archivePrefix = "arXiv",
	+ primaryClass = "hep-ph",
	+ reportNumber = "FERMILAB-PUB-06-337-T, CERN-LCGAPP-2006-03",
	+ SLACcitation = "%%CITATION = HEP-PH/0609017;%%"
	+}
	+@article{Andersen:2018tnm,
	+ author = "Andersen, Jeppe R. and Hapola, Tuomas and Heil, Marian
	+ and Maier, Andreas and Smillie, Jennifer M.",
	+ title = "{Higgs-boson plus Dijets: Higher-Order Matching for
	+ High-Energy Predictions}",
	+ year = "2018",
	+ eprint = "1805.04446",
	+ archivePrefix = "arXiv",
	+ primaryClass = "hep-ph",
	+ reportNumber = "DCPT/18/66, IPPP/18/33, MCnet-18-10, DCPT-18-66,
	+ IPPP-18-33, MCNET-18-10",
	+ SLACcitation = "%%CITATION = ARXIV:1805.04446;%%"
	+}
	diff --git a/doc/developer_manual/developer_manual.tex b/doc/developer_manual/developer_manual.tex
	new file mode 100644
	index 0000000..4a402a6
	--- /dev/null
	+++ b/doc/developer_manual/developer_manual.tex
	@@ -0,0 +1,888 @@
	+\documentclass[a4paper,11pt]{article}
	+
	+\usepackage{fourier}
	+\usepackage[T1]{fontenc}
	+\usepackage{microtype}
	+\usepackage{geometry}
	+\usepackage{enumitem}
	+\setlist[description]{leftmargin=\parindent,labelindent=\parindent}
	+\usepackage{amsmath}
	+\usepackage{amssymb}
	+\usepackage[utf8]{inputenc}
	+\usepackage{graphicx}
	+\usepackage{xcolor}
	+\usepackage{todonotes}
	+\usepackage{listings}
	+\usepackage{xspace}
	+\usepackage{tikz}
	+\usetikzlibrary{arrows.meta}
	+\usetikzlibrary{shapes}
	+\usetikzlibrary{calc}
	+\usepackage[colorlinks,linkcolor={blue!50!black}]{hyperref}
	+\graphicspath{{build/figures/}{figures/}}
	+
	+\newcommand{\HEJ}{{\tt HEJ}\xspace}
	+\newcommand{\HIGHEJ}{\emph{High Energy Jets}\xspace}
	+\newcommand{\cmake}{\href{https://cmake.org/}{cmake}\xspace}
	+\newcommand{\html}{\href{https://www.w3.org/html/}{html}\xspace}
	+\newcommand{\YAML}{\href{http://yaml.org/}{YAML}\xspace}
	+
	+\definecolor{darkgreen}{rgb}{0,0.4,0}
	+\lstset{ %
	+ backgroundcolor=\color{lightgray}, % choose the background color; you must add \usepackage{color} or \usepackage{xcolor}
	+ basicstyle=\footnotesize\usefont{T1}{DejaVuSansMono-TLF}{m}{n}, % the size of the fonts that are used for the code
	+ breakatwhitespace=false, % sets if automatic breaks should only happen at whitespace
	+ breaklines=false, % sets automatic line breaking
	+ captionpos=t, % sets the caption-position to bottom
	+ commentstyle=\color{red}, % comment style
	+ deletekeywords={...}, % if you want to delete keywords from the given language
	+ escapeinside={\%}{)}, % if you want to add LaTeX within your code
	+ extendedchars=true, % lets you use non-ASCII characters; for 8-bits encodings only, does not work with UTF-8
	+ frame=false, % adds a frame around the code
	+ keepspaces=true, % keeps spaces in text, useful for keeping indentation of code (possibly needs columns=flexible)
	+ keywordstyle=\color{blue}, % keyword style
	+ otherkeywords={}, % if you want to add more keywords to the set
	+ numbers=none, % where to put the line-numbers; possible values are (none, left, right)
	+ numbersep=5pt, % how far the line-numbers are from the code
	+ rulecolor=\color{black}, % if not set, the frame-color may be changed on line-breaks within not-black text (e.g. comments (green here))
	+ showspaces=false, % show spaces everywhere adding particular underscores; it overrides 'showstringspaces'
	+ showstringspaces=false, % underline spaces within strings only
	+ showtabs=false, % show tabs within strings adding particular underscores
	+ stepnumber=2, % the step between two line-numbers. If it's 1, each line will be numbered
	+ stringstyle=\color{gray}, % string literal style
	+ tabsize=2, % sets default tabsize to 2 spaces
	+ title=\lstname,
	+ emph={},
	+ emphstyle=\color{darkgreen}
	+}
	+
	+\begin{document}
	+
	+\tikzstyle{mynode}=[rectangle split,rectangle split parts=2, draw,rectangle split part fill={lightgray, none}]
	+
	+
	+\title{Reversed HEJ developer manual}
	+\author{}
	+\maketitle
	+\tableofcontents
	+
	+\newpage
	+
	+\section{Overview}
	+\label{sec:overview}
	+
	+Reversed HEJ is a C++ program and library implementing an algorithm to
	+apply \HIGHEJ resummation~\cite{Andersen:2008ue,Andersen:2008gc} to
	+pre-generated fixed-order events. This document is intended to give an
	+overview over the concepts and structure of this implementation.
	+
	+\subsection{Project structure}
	+\label{sec:project}
	+
	+Reversed HEJ is developed under the \href{https://git-scm.com/}{git}
	+version control system. The main repository is on the IPPP
	+\href{https://gitlab.com/}{gitlab} server under
	+\url{https://gitlab.dur.scotgrid.ac.uk/hej/reversed_hej}. To get a local
	+copy, get an account on the gitlab server and use
	+\begin{lstlisting}[language=sh,caption={}]
	+ git clone git@gitlab.dur.scotgrid.ac.uk:hej/reversed_hej.git
	+\end{lstlisting}
	+This should create a directory \texttt{reversed\_hej} with the following
	+contents:
	+\begin{description}
	+\item[doc:] Contains additional documentation, see section~\ref{sec:doc}.
	+\item[include:] Contains the C++ header files.
	+\item[src:] Contains the C++ source files.
	+\item[t:] Contains the source code for the automated tests.
	+\item[CMakeLists.txt:] Configuration file for the \cmake build
	+ system. See section~\ref{sec:cmake}.
	+\item[cmake:] Auxiliary files for \cmake. This includes modules for
	+ finding installed software in \texttt{cmake/Modules} and templates for
	+ code generation during the build process in \texttt{cmake/Templates}.
	+\item[config.yml:] Sample configuration file for running reversed HEJ.
	+\item[events.lhe:] Fixed-order event sample that can be used as input
	+ for reversed HEJ.
	+\item[FixedOrderGen:] Contains the code for the fixed-order generator,
	+ see section~\ref{sec:HEJFOG}.
	+\end{description}
	+In the following all paths are given relative to the
	+\texttt{reversed\_hej} directory.
	+
	+\subsection{Documentation}
	+\label{sec:doc}
	+
	+The \texttt{doc} directory contains user documentation in
	+\texttt{doc/sphinx} and the configuration to generate source code
	+documentation in \texttt{doc/doxygen}.
	+
	+The user documentation explains how to install and run reversed HEJ. The
	+format is
	+\href{http://docutils.sourceforge.net/rst.html}{reStructuredText}, which
	+is mostly human-readable. Other formats, like \html, can be generated with the
	+\href{http://www.sphinx-doc.org/en/master/}{sphinx} generator with
	+\begin{lstlisting}[language=sh,caption={}]
	+ make html
	+\end{lstlisting}
	+
	+
	+To document the source code we use
	+\href{https://www.stack.nl/~dimitri/doxygen/}{doxygen}. To generate
	+\html documentation, use the command
	+\begin{lstlisting}[language=sh,caption={}]
	+ doxygen -g Doxyfile
	+\end{lstlisting}
	+in the \texttt{doc/doxygen} directory.
	+
	+\subsection{Build system}
	+\label{sec:cmake}
	+
	+For the most part, reversed HEJ is a library providing classes and
	+functions that can be used to add resummation to fixed-order events. In
	+addition, there is a relatively small executable program leveraging this
	+library to read in events from an input file and produce resummation
	+events. Both the library and the program are built and installed with
	+the help of \cmake.
	+
	+In addition to the general build process described in the user
	+documentation, see section~\ref{sec:doc}, it can be useful to build reversed
	+HEJ with debugging information using
	+\begin{lstlisting}[language=sh,caption={}]
	+ cmake base/directory -DCMAKE_BUILD_TYPE=Debug
	+ make install
	+\end{lstlisting}
	+This faciliates the use of debuggers like \href{https://www.gnu.org/software/gdb/}{gdb}.
	+
	+The main \cmake configuration file is \texttt{CMakeLists.txt}. It defines the
	+compiler flags, software prerequisites, header and source files used to
	+build reversed HEJ, and the automated tests. In addition,
	+\texttt{cmake/Modules} contains module files that help with the
	+detection of the software prerequisites and \texttt{cmake/Templates}
	+contains template files for the automatic generation of header and
	+source files. For example, this allows to only keep the version
	+information in one central location (\texttt{CMakeLists.txt}) and
	+automatically generate a header file to propagate this to the C++ code.
	+
	+\subsection{General coding guidelines}
	+\label{sec:notes}
	+
	+The goal is to make the reversed HEJ code well-structured and
	+readable. Here are a number of guidelines to this end.
	+
	+\begin{description}
	+\item[Observe the boy scout rule.] Always leave the code cleaner
	+ than how you found it. Ugly hacks can be useful for testing, but
	+ shouldn't make their way into the main branch.
	+\item[Ask if something is unclear.] Often there is a good reason why
	+ code is written the way it is. Sometimes that reason is only obvious to
	+ the original author (use \lstinline!git blame! to find them), in which
	+ case they should be poked to add a comment. Sometimes there is no good
	+ reason, but nobody has had the time to come up with something better,
	+ yet. In some places the code might just be bad.
	+\item[Don't break tests.] There are a number of tests in the \texttt{t}
	+ directory, which can be run with \lstinline!make test!. Ideally, all
	+ tests should run successfully in each git revision.
	+\item[Test your new code.] When you add some new functionality, also add an
	+ automated test. This can be useful even if you don't know the
	+ ``correct'' result because it prevents the code from changing its behaviour
	+ silently in the future.
	+\end{description}
	+
	+\section{Program flow}
	+\label{sec:flow}
	+
	+A run of the reversed HEJ program has three stages: initialisation,
	+event processing, and cleanup. The following sections outline these
	+stages and their relations to the various classes and functions in the
	+code. Unless denoted otherwise, all classes and functions are part of
	+the \lstinline!RHEJ! namespace. The code for the reversed HEJ program is
	+in \texttt{src/main.cc}, all other code comprises the reversed HEJ
	+library. Classes and free functions are usually implemented in header
	+and source files with a corresponding name, i.e. the code for
	+\lstinline!MyClass! can usually be found in
	+\texttt{include/RHEJ/MyClass.hh} and \texttt{src/MyClass.cc}.
	+
	+\subsection{Initialisation}
	+\label{sec:init}
	+
	+The first step is to load and parse the \YAML configuration file. The
	+entry point for this is the \lstinline!load_config! function and the
	+related code can be found in \texttt{include/RHEJ/YAMLreader.hh},
	+\texttt{include/RHEJ/config.hh} and the corresponding \texttt{.cc} files
	+in the \texttt{src} directory. The implementation is based on the
	+\href{https://github.com/jbeder/yaml-cpp}{yaml-cpp} library.
	+The \lstinline!load_config! function returns a \lstinline!Config! object
	+containing all settings. To detect potential mistakes as early as
	+possible, we throw an exception whenever one of the following errors
	+occurs:
	+\begin{itemize}
	+\item There is an unknown option in the \YAML file.
	+\item A setting is invalid, for example a string is given where a number
	+ would be expected.
	+\item An option value is not set.
	+\end{itemize}
	+The third rule is sometimes relaxed for ``advanced'' settings with an
	+obvious default, like for importing custom scales or analyses.
	+
	+The information stored in the \lstinline!Config! object is then used to
	+initialise various objects required for the event processing stage
	+described in section~\ref{sec:processing}. First, the
	+\lstinline!get_analysis! function creates an object that inherits from
	+the \lstinline!Analysis! interface.\footnote{In the context of C++ the
	+proper technical expression is ``pure abstract class''.} Using an
	+interface allows us to decide the concrete type of the analysis at run
	+time instead of having to make a compile-time decision. Depending on the
	+settings, \lstinline!get_analysis! creates either a user-defined
	+analysis loaded from an external library (see the user documentation
	+\todo{link}) or the default \lstinline!EmptyAnalysis!, which does
	+nothing.
	+
	+Together with a number of further objects, whose roles are described in
	+section~\ref{sec:processing}, we also initialise the global random
	+number generator. We again use an interface to defer deciding the
	+concrete type until the program is actually run. Currently, we support the
	+\href{https://mixmax.hepforge.org/}{MIXMAX}
	+(\texttt{include/RHEJ/Mixmax.hh}) and Ranlux64
	+(\texttt{include/RHEJ/Ranlux64.hh}) random number generators.
	+
	+We also set up a \lstinline!LHEF::Reader! object (see
	+\texttt{include/LHEF/LHEF.h}) for reading events from a file in the Les
	+Houches event file format~\cite{Alwall:2006yp}. A small wrapper around
	+the
	+\href{https://www.boost.org/doc/libs/1_67_0/libs/iostreams/doc/index.html}{boost
	+iostreams} library allows us to also read event files compressed with
	+\href{https://www.gnu.org/software/gzip/}{gzip}. The wrapper code is in
	+\texttt{include/RHEJ/stream.hh} and the \texttt{src/stream.cc}.
	+
	+\subsection{Event processing}
	+\label{sec:processing}
	+
	+In the second stage events are continously read from the event
	+file. After jet clustering, a number of corresponding resummation events
	+are generated for each input event and fed into the analysis and a
	+number of output files. The roles of various classes and functions are
	+illustrated in the following flow chart:
	+\begin{center}
	+ \begin{tikzpicture}[node distance=2cm and 5mm]
	+ \node (reader) [mynode]
	+ {\lstinline!LHEF::Reader::readEvent!\nodepart{second}{read event}};
	+ \node
	+ (cluster) [mynode,below=of reader]
	+ {\lstinline!Event! constructor\nodepart{second}{cluster jets}};
	+ \node
	+ (resum) [mynode,below=of cluster]
	+ {\lstinline!EventReweighter::reweight!\nodepart{second}{perform resummation}};
	+ \node
	+ (cut) [mynode,below=of resum]
	+ {\lstinline!Analysis::pass_cuts!\nodepart{second}{apply cuts}};
	+ \node
	+ (fill) [mynode,below left=of cut]
	+ {\lstinline!Analysis::fill!\nodepart{second}{analyse event}};
	+ \node
	+ (write) [mynode,below right=of cut]
	+ {\lstinline!CombinedEventWriter::write!\nodepart{second}{write out event}};
	+ \node
	+ (control) [below=of cut] {};
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ (reader.south) -- node[left] {\lstinline!LHEF::HEPEUP!} (cluster.north);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ (cluster.south) -- node[left] {\lstinline!Event!} (resum.north);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ (resum.south) -- (cut.north);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ ($(resum.south)+(7mm, 0cm)$) -- ($(cut.north)+(7mm, 0cm)$);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ ($(resum.south)-(7mm, 0cm)$) -- node[left] {\lstinline!Event!} ($(cut.north)-(7mm, 0cm)$);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ ($(cut.south)-(3mm,0mm)$) .. controls ($(control)-(3mm,0mm)$) ..node[left] {\lstinline!Event!} (fill.east);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ ($(cut.south)-(3mm,0mm)$) .. controls ($(control)-(3mm,0mm)$) .. (write.west);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ ($(cut.south)+(3mm,0mm)$) .. controls ($(control)+(3mm,0mm)$) .. (fill.east);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ ($(cut.south)+(3mm,0mm)$) .. controls ($(control)+(3mm,0mm)$) ..node[right] {\lstinline!Event!} (write.west);
	+ \end{tikzpicture}
	+\end{center}
	+The resummation is performed by the \lstinline!EventReweighter! class,
	+which is described in more detail in section~\ref{sec:resum}. The
	+\lstinline!CombinedEventWriter! writes events to zero or more output
	+files. To this end, it contains a number of objects implementing the
	+\lstinline!EventWriter! interface. These event writers typically write
	+the events to a file in a given format. We currently have the
	+\lstinline!LesHouchesWriter! for event files in the Les Houches Event
	+File format and the \lstinline!HepMCWriter! for the
	+\href{https://hepmc.web.cern.ch/hepmc/}{HepMC} format.
	+
	+\subsection{Resummation}
	+\label{sec:resum}
	+
	+In the \lstinline!EventReweighter::reweight! member function, we first
	+classify the input fixed-order event (FKL, unordered, non-HEJ, \dots)
	+and decide according to the user settings whether to discard, keep, or
	+resum the event. If we perform resummation for the given event, we
	+generate a number of trial \lstinline!PhaseSpacePoint! objects. Phase
	+space generation is discussed in more detail in
	+section~\ref{sec:pspgen}. We then perform jet clustering according to
	+the settings for the resummation jets on each
	+\lstinline!PhaseSpacePoint!, update the factorisation and
	+renormalisation scale in the resulting \lstinline!Event! and reweight it
	+according to the ratio of pdf factors and \HEJ matrix elements between
	+resummation and original fixed-order event:
	+\begin{center}
	+ \begin{tikzpicture}[node distance=2cm and 5mm]
	+ \node (in) {};
	+ \node (treat) [diamond,draw,below=of in,minimum size=3.5cm,
	+ label={[anchor=west, inner sep=8pt]west:discard},
	+ label={[anchor=east, inner sep=14pt]east:keep},
	+ label={[anchor=south, inner sep=20pt]south:reweight}
	+ ] {};
	+ \draw (treat.north west) -- (treat.south east);
	+ \draw (treat.north east) -- (treat.south west);
	+ \node
	+ (psp) [mynode,below=of treat]
	+ {\lstinline!PhaseSpacePoint! constructor};
	+ \node
	+ (cluster) [mynode,below=of psp]
	+ {\lstinline!Event! constructor\nodepart{second}{cluster jets}};
	+ \node
	+ (gen_scales) [mynode,below=of cluster]
	+ {\lstinline!ScaleGenerator::operator()!\nodepart{second}{update scales}};
	+ \node
	+ (rescale) [mynode,below=of gen_scales]
	+ {\lstinline!PDF::pdfpt!,
	+ \lstinline!MatrixElement!\nodepart{second}{reweight}};
	+ \node (out) [below of=rescale] {};
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ (in.south) -- node[left] {\lstinline!Event!} (treat.north);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ (treat.south) -- node[left] {\lstinline!Event!} (psp.north);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ (psp.south) -- (cluster.north);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ ($(psp.south)+(7mm, 0cm)$) -- ($(cluster.north)+(7mm, 0cm)$);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ ($(psp.south)-(7mm, 0cm)$) -- node[left]
	+ {\lstinline!PhaseSpacePoint!} ($(cluster.north)-(7mm, 0cm)$);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ (cluster.south) -- (gen_scales.north);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ ($(cluster.south)+(7mm, 0cm)$) -- ($(gen_scales.north)+(7mm, 0cm)$);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ ($(cluster.south)-(7mm, 0cm)$) -- node[left]
	+ {\lstinline!Event!} ($(gen_scales.north)-(7mm, 0cm)$);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ (gen_scales.south) -- (rescale.north);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ ($(gen_scales.south)+(7mm, 0cm)$) -- ($(rescale.north)+(7mm, 0cm)$);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ ($(gen_scales.south)-(7mm, 0cm)$) -- node[left]
	+ {\lstinline!Event!} ($(rescale.north)-(7mm, 0cm)$);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ (rescale.south) -- (out.north);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ ($(rescale.south)+(7mm, 0cm)$) -- ($(out.north)+(7mm, 0cm)$);
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ ($(rescale.south)-(7mm, 0cm)$) -- node[left]
	+ {\lstinline!Event!} ($(out.north)-(7mm, 0cm)$);
	+ \node (helper) at ($(treat.east) + (15mm,0cm)$) {};
	+ \draw[-{Latex[length=3mm, width=1.5mm]}]
	+ (treat.east) -- ($(treat.east) + (15mm,0cm)$)
	+ -- node[left] {\lstinline!Event!} (helper \|- gen_scales.east) -- (gen_scales.east)
	+ ;
	+ \end{tikzpicture}
	+\end{center}
	+
	+
	+\subsection{Phase space point generation}
	+\label{sec:pspgen}
	+
	+The resummed and matched \HEJ cross section for pure jet production of
	+FKL configurations is given by (cf. eq. (3) of~\cite{Andersen:2018tnm})
	+\begin{align}
	+ \label{eq:resumdijetFKLmatched2}
	+% \begin{split}
	+ \sigma&_{2j}^\mathrm{resum, match}=\sum_{f_1, f_2}\ \sum_m
	+ \prod_{j=1}^m\left(
	+ \int_{p_{j\perp}^B=0}^{p_{j\perp}^B=\infty}
	+ \frac{\mathrm{d}^2\mathbf{p}_{j\perp}^B}{(2\pi)^3}\ \int
	+ \frac{\mathrm{d} y_j^B}{2} \right) \
	+ (2\pi)^4\ \delta^{(2)}\!\!\left(\sum_{k=1}^{m}
	+ \mathbf{p}_{k\perp}^B\right)\nonumber\\
	+ &\times\ x_a^B\ f_{a, f_1}(x_a^B, Q_a^B)\ x_b^B\ f_{b, f_2}(x_b^B, Q_b^B)\
	+ \frac{\overline{\left\|\mathcal{M}_\text{LO}^{f_1f_2\to f_1g\cdots
	+ gf_2}\big(\big\{p^B_j\big\}\big)\right\|}^2}{(\hat {s}^B)^2}\nonumber\\
	+& \times (2\pi)^{-4+3m}\ 2^m \nonumber\\
	+&\times\ \sum_{n=2}^\infty\
	+\int_{p_{1\perp}=p_{\perp,\mathrm{min}} }^{p_{1\perp}=\infty}
	+ \frac{\mathrm{d}^2\mathbf{p}_{1\perp}}{(2\pi)^3}\
	+ \int_{p_{n\perp}=p_{\perp,\mathrm{min}}}^{p_{n\perp}=\infty}
	+ \frac{\mathrm{d}^2\mathbf{p}_{n\perp}}{(2\pi)^3}\
	+ \prod_{i=2}^{n-1}\int_{p_{i\perp}=\lambda}^{p_{i\perp}=\infty}
	+ \frac{\mathrm{d}^2\mathbf{p}_{i\perp}}{(2\pi)^3}\ (2\pi)^4\ \delta^{(2)}\!\!\left(\sum_{k=1}^n
	+ \mathbf{p}_{k\perp}\right )\\
	+ &\times \ \mathbf{T}_y \prod_{i=1}^n
	+ \left(\int \frac{\mathrm{d} y_i}{2}\right)\
	+ \mathcal{O}_{mj}^e\
	+ \left(\prod_{l=1}^{m-1}\delta^{(2)}(\mathbf{p}_{\mathcal{J}_{l}\perp}^B -
	+ \mathbf{j}_{l\perp})\right)\
	+ \left(\prod_{l=1}^m\delta(y^B_{\mathcal{J}_l}-y_{\mathcal{J}_l})\right)
	+ \ \mathcal{O}_{2j}(\{p_i\})\nonumber\\
	+ &\times \frac{(\hat{s}^B)^2}{\hat{s}^2}\ \frac{x_a f_{a,f_1}(x_a, Q_a)\ x_b f_{b,f_2}(x_b, Q_b)}{x_a^B\ f_{a,f_1}(x_a^B, Q_a^B)\ x_b^B\ f_{b,f_2}(x_b^B, Q_b^B)}\ \frac{\overline{\left\|\mathcal{M}_{\mathrm{HEJ}}^{f_1 f_2\to f_1 g\cdots
	+ gf_2}(\{ p_i\})\right\|}^2}{\overline{\left\|\mathcal{M}_\text{LO, HEJ}^{f_1f_2\to f_1g\cdots
	+ gf_2}\big(\big\{p^B_j\big\}\big)\right\|}^{2}} \,.\nonumber
	+% \end{split}
	+\end{align}
	+The first two lines correspond to the generation of the fixed-order
	+input events with incoming partons $f_1, f_2$ and outgoing momenta
	+$p_j^B$, where $\mathbf{p}_{j\perp}^B$ and $y_j^B$ denote the respective
	+transverse momentum and rapidity. Note that, at leading order, these
	+coincide with the fixed-order jet momenta $p_{\mathcal{J}_j}^B$. $f_{a,f_1}(x_a, Q_a),
	+f_{b,f_2}(x_b, Q_b)$ are the pdf factors for the incoming partons with
	+momentum fractions $x_a$ and $x_b$. The square of the partonic
	+centre-of-mass energy is denoted by $\hat{s}^B$ and
	+$\mathcal{M}_\text{LO}^{f_1f_2\to f_1g\cdots gf_2}$ is the
	+leading-order matrix element.
	+
	+The third line is a factor accounting for the different multiplicities
	+between fixed-order and resummation events. Lines four and five are
	+the integration over the resummation phase space described in this
	+section. $p_i$ are the momenta of the outgoing partons in resummation
	+phase space. $\mathbf{T}_y$ denotes rapidity
	+ordering and $\mathcal{O}_{mj}^e$ projects out the exclusive $m$-jet
	+component. The relation between resummation and fixed-order momenta is
	+fixed by the $\delta$ functions. The first sets each transverse fixed-order jet
	+momentum to some function $\mathbf{j_{l\perp}}$ of the resummation
	+momenta. The exact form is described in section~\ref{sec:ptj_res}. The second
	+$\delta$ forces the rapidities of resummation and fixed-order jets to be
	+the same. Finally, the last line is the reweighting of pdf and matrix
	+element factors already shown in section~\ref{sec:resum}.
	+
	+There are two kinds of cut-off in the integration over the resummation
	+partons. $\lambda$ is a technical cut-off connected to the cancellation
	+of infrared divergencies between real and virtual corrections. Its
	+numerical value is set in
	+\texttt{include/RHEJ/Constants.h}. $p_{\perp,\mathrm{min}}$ regulates
	+and \emph{uncancelled} divergence in the extremal parton momenta. Its
	+size is set by the user configuration \todo{link}.
	+
	+It is straightforward to generalise eq.~(\ref{eq:resumdijetFKLmatched2})
	+to unordered configurations and processes with additional colourless
	+emissions, for example a Higgs or electroweak boson. In the latter case only
	+the fixed-order integration and the matrix elements change.
	+
	+\subsubsection{Gluon Multiplicity}
	+\label{sec:psp_ng}
	+
	+The first step in evaluating the resummation phase space in
	+eq.~(\ref{eq:resumdijetFKLmatched2}) is to randomly pick terms in the
	+sum over the number of emissions. This sampling of the gluon
	+multiplicity is done in the \lstinline!PhaseSpacePoint::sample_ng!
	+function in \texttt{src/PhaseSpacePoint.cc}.
	+
	+The typical number of extra emissions depends strongly on the rapidity
	+span of the underlying fixed-order event. Let us, for example, consider
	+a fixed-order FKL-type multi-jet configuration with rapidities
	+$y_{j_f},\,y_{j_b}$ of the most forward and backward jets,
	+respectively. By eq.~(\ref{eq:resumdijetFKLmatched2}), the jet
	+multiplicity and the rapidity of each jet are conserved when adding
	+resummation. This implies that additional hard radiation is restricted
	+to rapidities $y$ within a region $y_{j_b} \lesssim y \lesssim
	+y_{j_f}$. Within \HEJ, we require the most forward and most backward
	+emissions to be hard in order to avoid divergences, so this constraint
	+in fact applies to \emph{all} additional radiation.
	+
	+To simplify the remaining discussion, let us remove the FKL rapidity
	+ordering
	+\begin{equation}
	+ \label{eq:remove_y_order}
	+ \mathbf{T}_y \prod_{i=1}^n\int \frac{\mathrm{d}y_i}{2} =
	+ \frac{1}{n!}\prod_{i=1}^n\int
	+ \frac{\mathrm{d}y_i}{2}\,,
	+\end{equation}
	+where all rapidity integrals now cover a region which is approximately
	+bounded by $y_{j_b}$ and $y_{j_f}$. Each of the $m$ jets has to contain at least
	+one parton; selecting random emissions we can rewrite the phase space
	+integrals as
	+\begin{equation}
	+ \label{eq:select_jets}
	+ \frac{1}{n!}\prod_{i=1}^n\int [\mathrm{d}p_i] =
	+ \left(\prod_{i=1}^{m}\int [\mathrm{d}p_i]\ {\cal J}_i(p_i)\right)
	+ \frac{1}{n_g!}\prod_{i=m+1}^{m+n_g}\int [\mathrm{d}p_i]
	+\end{equation}
	+with jet selection functions
	+\begin{equation}
	+ \label{eq:def_jet_selection}
	+ {\cal J}_i(p) =
	+ \begin{cases}
	+ 1 &p\text{ clustered into jet }i\\
	+ 0 & \text{otherwise}
	+ \end{cases}
	+\end{equation}
	+and $n_g \equiv n - m$. Here and in the following we use the short-hand
	+notation $[\mathrm{d}p_i]$ to denote the phase-space measure for parton
	+$i$. As is evident from eq.~\eqref{eq:select_jets}, adding an extra emission
	+$n_g+1$ introduces a suppression factor $\tfrac{1}{n_g+1}$. However, the
	+additional phase space integral also results in an enhancement proportional
	+to $\Delta y_{j_f j_b} = y_{j_f} - y_{j_b}$. This is a result of the
	+rapidity-independence of the MRK limit of the integrand, consisting of the
	+matrix elements divided by the flux factor. Indeed, we observe that the
	+typical number of gluon emissions is to a good approximation proportional to
	+the rapidity separation and the phase space integral is dominated by events
	+with $n_g \approx \Delta y_{j_f j_b}$.
	+
	+For the actual phase space sampling, we assume a Poisson distribution
	+and extract the mean number of gluon emissions in different rapidity
	+bins and fit the results to a linear function in $\Delta y_{j_f j_b}$,
	+finding a coefficient of $0.975$ for the inclusive production of a Higgs
	+boson with two jets. Here are the observed and fitted average gluon
	+multiplicities as a function of $\Delta y_{j_f j_b}$:
	+\begin{center}
	+ \includegraphics[width=.75\textwidth]{ng_mean}
	+\end{center}
	+As shown for two rapidity slices the assumption of a Poisson
	+distribution is also a good approximation:
	+\begin{center}
	+ \includegraphics[width=.49\textwidth]{{ng_1.5}.pdf}\hfill
	+ \includegraphics[width=.49\textwidth]{{ng_5.5}.pdf}
	+\end{center}
	+
	+\subsubsection{Number of Gluons inside Jets}
	+\label{sec:psp_ng_jet}
	+
	+For each of the $n_g$ gluon emissions we can split the phase-space
	+integral into a (disconnected) region inside the jets and a remainder:
	+\begin{equation}
	+ \label{eq:psp_split}
	+ \int [\mathrm{d}p_i] = \int [\mathrm{d}p_i]\,
	+ \theta\bigg(\sum_{j=1}^{m}{\cal J}_j(p_i)\bigg) + \int [\mathrm{d}p_i]\,
	+ \bigg[1-\theta\bigg(\sum_{j=1}^{m}{\cal J}_j(p_i)\bigg)\bigg]\,.
	+\end{equation}
	+The next step is to decide how many of the gluons will form part of a
	+jet. This is done in the \lstinline!PhaseSpacePoint::sample_ng_jets!
	+function.
	+
	+We choose an importance sampling which is flat in the plane
	+spanned by the azimuthal angle $\phi$ and the rapidity $y$. This is
	+observed in BFKL and valid in the limit of Multi-Regge-Kinematics
	+(MRK). Furthermore, we assume anti-$k_t$ jets, which cover an area of
	+$\pi R^2$.
	+
	+In principle, the total accessible area in the $y$-$\phi$ plane is given
	+by $2\pi \Delta y_{fb}$, where $\Delta y_{fb}\geq \Delta y_{j_f j_b}$ is
	+the a priori unknown rapidity separation between the most forward and
	+backward partons. In most cases the extremal jets consist of single
	+partons, so that $\Delta y_{fb} = \Delta y_{j_f j_b}$. For the less common
	+case of two partons forming a jet we observe a maximum distance of $R$
	+between the constituents and the jet centre. In rare cases jets have
	+more than two constituents. Empirically, they are always within a
	+distance of $\tfrac{5}{3}R$ to the centre of the jet, so
	+$\Delta y_{fb} \leq \Delta y_{j_f j_b} + \tfrac{10}{3} R$. In practice, the
	+extremal partons are required to carry a large fraction of the jet
	+transverse momentum and will therefore be much closer to the jet axis.
	+
	+In summary, for sufficiently large rapidity separations we can use the
	+approximation $\Delta y_{fb} \approx \Delta y_{j_f j_b}$. This scenario
	+is depicted here:
	+\begin{center}
	+ \includegraphics[width=0.5\linewidth]{ps_large_y}
	+\end{center}
	+If there is no overlap between jets, the probability $p_{\cal J, >}$ for
	+an extra gluon to end up inside a jet is then given by
	+\begin{equation}
	+ \label{eq:p_J_large}
	+ p_{\cal J, >} = \frac{(m - 1)\*R^2}{2\Delta y_{j_f j_b}}\,.
	+\end{equation}
	+For a very small rapidity separation, eq.~\eqref{eq:p_J_large}
	+obviously overestimates the true probability. The maximum phase space
	+covered by jets in the limit of a vanishing rapidity distance between
	+all partons is $2mR \Delta y_{fb}$:
	+\begin{center}
	+ \includegraphics[width=0.5\linewidth]{ps_small_y}
	+\end{center}
	+We therefore estimate the probability for a parton
	+to end up inside a jet as
	+\begin{equation}
	+ \label{eq:p_J}
	+ p_{\cal J} = \min\bigg(\frac{(m - 1)\*R^2}{2\Delta y_{j_f j_b}}, \frac{mR}{\pi}\bigg)\,.
	+\end{equation}
	+Here we compare this estimate with the actually observed
	+fraction of additional emissions into jets as a function of the rapidity
	+separation:
	+\begin{center}
	+ \includegraphics[width=0.75\linewidth]{pJ}
	+\end{center}
	+
	+\subsubsection{Gluons outside Jets}
	+\label{sec:gluons_nonjet}
	+
	+Using our estimate for the probability of a gluon to be a jet
	+constituent, we choose a number $n_{g,{\cal J}}$ of gluons inside
	+jets, which also fixes the number $n_g - n_{g,{\cal J}}$ of gluons
	+outside jets. As explained later on, we need to generate the momenta of
	+the gluons outside jets first. This is done in
	+\lstinline!PhaseSpacePoint::gen_non_jet!.
	+
	+The azimuthal angle $\phi$ is generated flat within $0\leq \phi \leq 2
	+\pi$. The allowed rapidity interval is set by the most forward and
	+backward partons, which are necessarily inside jets. Since these parton
	+rapidities are not known at this point, we also have to postpone the
	+rapidity generation for the gluons outside jets. For the scalar
	+transverse momentum $p_\perp = \|\mathbf{p}_\perp\|$ of a gluon outside
	+jets we use the parametrisation
	+\begin{equation}
	+ \label{eq:p_nonjet}
	+ p_\perp = \lambda + \tilde{p}_\perp\\tan(\tau\r)\,, \qquad
	+ \tau = \arctan\bigg(\frac{p_{\perp{\cal J}_\text{min}} - \lambda}{\tilde{p}_\perp}\bigg)\,.
	+\end{equation}
	+For $r \in [0,1)$, $p_\perp$ is always less than the minimum momentum
	+$p_{\perp{\cal J}_\text{min}}$ required for a jet. $\tilde{p}_\perp$ is
	+a free parameter, a good empirical value is $\tilde{p}_\perp = [1.3 +
	+0.2\*(n_g - n_{g,\cal J})]\,$GeV
	+
	+\subsubsection{Resummation jet momenta}
	+\label{sec:ptj_res}
	+
	+On the one hand, each jet momentum is given by the sum of its
	+constituent momenta. On the other hand, the resummation jet momenta are
	+fixed by the constraints in line five of the master
	+equation~\eqref{eq:resumdijetFKLmatched2}. We therefore have to
	+calculate the resummation jet momenta from these constraints before
	+generating the momenta of the gluons inside jets. This is done in the
	+\lstinline!resummation_jet_momenta! function in \texttt{src/PhaseSpacePoint.cc}.
	+
	+The resummation jet momenta are determined by the $\delta$ functions in
	+line five of eq.~(\ref{eq:resumdijetFKLmatched2}). The rapidities are
	+fixed to the rapidities of the jets in the input fixed-order events, so
	+that the FKL ordering is guaranteed to be preserved. For the transverse
	+momentum components we currently use the traditional \HEJ reshuffling
	+relation
	+\begin{equation}
	+ \label{eq:ptreassign}
	+ \mathbf{p}^B_{\mathcal{J}_{l\perp}} = \mathbf{j}_{l\perp} \equiv \mathbf{p}_{\mathcal{J}_{l}\perp} + \mathbf{q}_\perp \,
	+ \frac{\|\mathbf{p}_{\mathcal{J}_{l}\perp}\|}{P_\perp},
	+\end{equation}
	+where $\mathbf{q}_\perp = \sum_{j=1}^n \mathbf{p}_{i\perp}
	+\bigg[1-\theta\bigg(\sum_{j=1}^{m}{\cal J}_j(p_i)\bigg)\bigg] $ is the
	+total transverse momentum of all partons \emph{outside} jets and
	+$P_\perp = \sum_{j=1}^m \|\mathbf{p}_{\mathcal{J}_{j}\perp}\|$. Since the
	+total transverse momentum of an event vanishes, we can also use
	+$\mathbf{q}_\perp = - \sum_{j=1}^m
	+\mathbf{p}_{\mathcal{J}_{j}\perp}$. Eq.~(\ref{eq:ptreassign}) is a
	+non-linear system of equations in the resummation jet momenta
	+$\mathbf{p}_{\mathcal{J}_{l}\perp}$. To solve it we use
	+\href{https://www.gnu.org/software/gsl/}{GSL} routines.
	+
	+The reshuffling relation~\eqref{eq:ptreassign} allows the transverse
	+momenta $p^B_{\mathcal{J}_{l\perp}}$ of the fixed-order jets to be
	+somewhat below the minimum transverse momentum of resummation jets. It
	+is crucial that this difference does not become too large, as the
	+fixed-order cross section diverges for vanishing transverse momenta. In
	+the production of a Higgs boson with resummation jets above $30\,$GeV we observe
	+that the contribution from fixed-order events with jets softer than
	+about $20\,$GeV can be safely neglected. This is shown in the following
	+plot of the differential cross section over the transverse momentum of
	+the softest fixed-order jet:
	+\begin{center}
	+ \includegraphics[width=.75\textwidth]{ptBMin}
	+\end{center}
	+
	+
	+\subsubsection{Gluons inside Jets}
	+\label{sec:gluons_jet}
	+
	+After the steps outlined in section~\ref{sec:psp_ng_jet}, we have a
	+total number of $m + n_{g,{\cal J}}$ constituents. In
	+\lstinline!PhaseSpacePoint::distribute_jet_partons! we distribute them
	+randomly among the jets such that each jet has at least one
	+constituent. We then generate their momenta in
	+\lstinline!PhaseSpacePoint::split! using the \lstinline!Splitter! class.
	+
	+The phase space integral for a jet ${\cal J}$ is given by
	+\begin{equation}
	+ \label{eq:ps_jetparton} \prod_{i\text{ in }{\cal J}} \bigg(\int
	+\mathrm{d}\mathbf{p}_{i\perp}\ \int \mathrm{d} y_i
	+\bigg)\delta^{(2)}\Big(\sum_{i\text{ in }{\cal J}} \mathbf{p}_{i\perp} -
	+\mathbf{j}_{\perp}^B\Big)\delta(y_{\mathcal{J}}-y^B_{\mathcal{J}})\,.
	+\end{equation}
	+For jets with a single constituent, the parton momentum is obiously equal to the
	+jet momentum. In the case of two constituents, we observe that the
	+partons are always inside the jet cone with radius $R$ and often very
	+close to the jet centre. The following plots show the typical relative
	+distance $\Delta R/R$ for this scenario:
	+\begin{center}
	+ \includegraphics[width=0.45\linewidth]{dR_2}
	+ \includegraphics[width=0.45\linewidth]{dR_2_small}
	+\end{center}
	+According to this preference for small values of $\Delta R$, we
	+parametrise the $\Delta R$ integrals as
	+\begin{equation}
	+ \label{eq:dR_sampling}
	+ \frac{\Delta R}{R} =
	+ \begin{cases}
	+ 0.25\,x_R & x_R < 0.4 \\
	+ 1.5\,x_R - 0.5 & x_R \geq 0.4
	+ \end{cases}\,.
	+\end{equation}
	+Next, we generate $\Theta_1 \equiv \Theta$ and use the constraint $\Theta_2 = \Theta
	+\pm \pi$. The transverse momentum of the first parton is then given by
	+\begin{equation}
	+ \label{eq:delta_constraints}
	+ p_{1\perp} =
	+ \frac{p_{\mathcal{J} y} - \tan(\phi_2) p_{\mathcal{J} x}}{\sin(\phi_1)
	+ - \tan(\phi_2)\cos(\phi_1)}\,.
	+\end{equation}
	+We get $p_{2\perp}$ by exchanging $1 \leftrightarrow 2$ in the
	+indices. To obtain the Jacobian of the transformation, we start from the
	+single jet phase space eq.~(\ref{eq:ps_jetparton}) with the rapidity
	+delta function already rewritten to be linear in the rapidity of the
	+last parton, i.e.
	+\begin{equation}
	+ \label{eq:jet_2p}
	+\prod_{i=1,2} \bigg(\int
	+\mathrm{d}\mathbf{p}_{i\perp}\ \int \mathrm{d} y_i
	+\bigg)\delta^{(2)}\Big(\mathbf{p}_{1\perp} + \mathbf{p}_{2\perp} -
	+\mathbf{j}_{\perp}^B\Big)\delta(y_2- \dots)\,.
	+\end{equation}
	+The integral over the second parton momentum is now trivial; we can just replace
	+the integral over $y_2$ with the equivalent constraint
	+\begin{equation}
	+ \label{eq:R2}
	+\int \mathrm{d}R_2 \ \delta\bigg(R_2 - \bigg[\phi_{\cal J} - \arctan
	+\bigg(\frac{p_{{\cal J}y} - p_{1y}}{p_{{\cal J}x} -
	+ p_{1x}}\bigg)\bigg]/\cos \Theta\bigg) \,.
	+\end{equation}
	+In order to fix the integral over $p_{1\perp}$ instead, we rewrite this
	+$\delta$ function. This introduces the Jacobian
	+\begin{equation}
	+ \label{eq:jac_pt1}
	+\bigg\|\frac{\partial p_{1\perp}}{\partial R_2} \bigg\| =
	+\frac{\cos(\Theta)\mathbf{p}_{2\perp}^2}{p_{{\cal J}\perp}\sin(\phi_{\cal J}-\phi_1)}\,.
	+\end{equation}
	+The final form of the integral over the two parton momenta is then
	+\begin{equation}
	+ \label{eq:ps_jet_2p}
	+\int \mathrm{d}R_1\ R_1 \int \mathrm{d}R_2 \int \mathrm{d}x_\Theta\ 2\pi \int
	+\mathrm{d}p_{1\perp}\ p_{1\perp} \int \mathrm{d}p_{2\perp}
	+\ \bigg\|\frac{\partial p_{1\perp}}{\partial R_2} \bigg\|\delta(p_{1\perp}
	+-\dots) \delta(p_{2\perp} - \dots)\,.
	+\end{equation}
	+
	+As is evident from section~\ref{sec:psp_ng_jet}, jets with three or more
	+constituents are rare and an efficient phase-space sampling is less
	+important. For such jets, we exploit the observation that partons with a
	+distance larger than $R_{\text{max}} = \tfrac{5}{3} R$ to
	+the jet centre are never clustered into the jet. Assuming $N$
	+constituents, we generate all components
	+for the first $N-1$ partons and fix the remaining parton with the
	+$\delta$-functional. In order to end up inside the jet, we use the
	+parametrisation
	+\begin{align}
	+ \label{eq:ps_jet_param}
	+ \phi_i ={}& \phi_{\cal J} + \Delta \phi_i\,, & \Delta \phi_i ={}& \Delta
	+ R_i
	+ \cos(\Theta_i)\,, \\
	+ y_i ={}& y_{\cal J} + \Delta y_i\,, & \Delta y_i ={}& \Delta
	+ R_i
	+ \sin(\Theta_i)\,,
	+\end{align}
	+and generate $\Theta_i$ and $\Delta R_i$ randomly with $\Delta R_i \leq
	+R_{\text{max}}$ and the empiric value $R_{\text{max}} = 5\*R/3$. We can
	+then write the phase space integral for a single parton as $(p_\perp = \|\mathbf{p}_\perp\|)$
	+\begin{equation}
	+ \label{eq:ps_jetparton_x}
	+ \int \mathrm{d}\mathbf{p}_{\perp}\ \int
	+ \mathrm{d} y \approx \int_{\Box} \mathrm{d}x_{\perp}
	+ \mathrm{d}x_{ R}
	+ \mathrm{d}x_{\theta}\
	+ 2\\pi\,\R_{\text{max}}^2\,\x_{R}\,\p_{\perp}\,\*(p_{\perp,\text{max}}
	+ - p_{\perp,\text{min}})
	+\end{equation}
	+with
	+\begin{align}
	+ \label{eq:ps_jetparton_parameters}
	+ \Delta \phi ={}& R_{\text{max}}\x_{R}\\cos(2\\pi\x_\theta)\,,&
	+ \Delta y ={}& R_{\text{max}}\x_{R}\\sin(2\\pi\x_\theta)\,, \\
	+ p_{\perp} ={}& (p_{\perp,\text{max}} - p_{\perp,\text{min}})\*x_\perp +
	+ p_{\perp,\text{min}}\,.
	+\end{align}
	+$p_{\perp,\text{max}}$ is determined from the requirement that the total
	+contribution from the first $n-1$ partons --- i.e. the projection onto the
	+jet $p_{\perp}$ axis --- must never exceed the jet $p_\perp$. This gives
	+\todo{This bound is too high}
	+\begin{equation}
	+ \label{eq:pt_max}
	+ p_{i\perp,\text{max}} = \frac{p_{{\cal J}\perp} - \sum_{j<i} p_{j\perp}
	+ \cos \Delta
	+\phi_j}{\cos \Delta
	+\phi_i}\,.
	+\end{equation}
	+The $x$ and $y$ components of the last parton follow immediately from
	+the first $\delta$ function. The last rapidity is fixed by the condition that
	+the jet rapidity is kept fixed by the reshuffling, i.e.
	+\begin{equation}
	+ \label{eq:yJ_delta}
	+ y^B_{\cal J} = y_{\cal J} = \frac 1 2 \ln \frac{\sum_{i=1}^n E_i+ p_{iz}}{\sum_{i=1}^n E_i - p_{iz}}\,.
	+\end{equation}
	+With $E_n \pm p_{nz} = p_{n\perp}\exp(\pm y_n)$ this can be rewritten to
	+\begin{equation}
	+ \label{eq:yn_quad_eq}
	+ \exp(2y_{\cal J}) = \frac{\sum_{i=1}^{n-1} E_i+ p_{iz}+p_{n\perp} \exp(y_n)}{\sum_{i=1}^{n-1} E_i - p_{iz}+p_{n\perp} \exp(-y_n)}\,,
	+\end{equation}
	+which is a quadratic equation in $\exp(y_n)$. The physical solution is
	+\begin{align}
	+ \label{eq:yn}
	+ y_n ={}& \log\Big(-b + \sqrt{b^2 + \exp(2y_{\cal J})}\,\Big)\,,\\
	+b ={}& \bigg(\sum_{i=1}^{n-1} E_i + p_{iz} - \exp(2y_{\cal J})
	+ \sum_{i=1}^{n-1} E_i - p_{iz}\bigg)/(2 p_{n\perp})\,.
	+\end{align}
	+\todo{what's wrong with the following?} To eliminate the remaining rapidity
	+integral, we transform the $\delta$ function to be linear in the
	+rapidity $y$ of the last parton. The corresponding Jacobian is
	+\begin{equation}
	+ \label{eq:jacobian_y}
	+ \bigg\|\frac{\partial y_{\cal J}}{\partial y_n}\bigg\|^{-1} = 2 \bigg( \frac{E_n +
	+ p_{nz}}{E_{\cal J} + p_{{\cal J}z}} + \frac{E_n - p_{nz}}{E_{\cal J} -
	+ p_{{\cal J}z}}\bigg)^{-1}\,.
	+\end{equation}
	+Finally, we check that all designated constituents are actually
	+clustered into the considered jet.
	+
	+\subsubsection{Final steps}
	+\label{sec:final}
	+
	+Knowing the rapidity span covered by the extremal partons, we can now
	+generate the rapdities for the partons outside jets. We perform jet
	+clustering on all partons and check in
	+\lstinline!PhaseSpacePoint::jets_ok! that all the following criteria are
	+fulfilled:
	+\begin{itemize}
	+\item The number of resummation jets must match the number of
	+ fixed-order jets.
	+\item No partons designated to be outside jets may end up inside jets.
	+\item All other outgoing partons \emph{must} end up inside jets.
	+\item The extremal (in rapidity) partons must be inside the extremal
	+ jets. If there is, for example, an unordered forward emission, the
	+ most forward parton must end up inside the most forward jet and the
	+ next parton must end up inside second jet.
	+\item The rapidities of fixed-order and resummation jets must match.
	+\end{itemize}
	+After this, we adjust the phase-space normalisation according to the
	+third line of eq.~(\ref{eq:resumdijetFKLmatched2}), determine the
	+flavours of the outgoing partons, and adopt any additional colourless
	+bosons from the fixed-order input event. Finally, we use momentum
	+conservation to reconstruct the momenta of the incoming partons.
	+
	+\subsection{The matrix element }
	+\label{sec:ME}
	+
	+
	+
	+\section{The fixed-order generator}
	+\label{sec:HEJFOG}
	+
	+
	+
	+\bibliographystyle{JHEP}
	+\bibliography{biblio}
	+
	+
	+\end{document}
	diff --git a/doc/developer_manual/figures/dR_2.pdf b/doc/developer_manual/figures/dR_2.pdf
	new file mode 100644
	index 0000000..5a8745c
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	diff --git a/doc/developer_manual/figures/dR_2_small.pdf b/doc/developer_manual/figures/dR_2_small.pdf
	new file mode 100644
	index 0000000..4880eea
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	diff --git a/doc/developer_manual/figures/ng_1.5.pdf b/doc/developer_manual/figures/ng_1.5.pdf
	new file mode 100644
	index 0000000..d405ea8
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	diff --git a/doc/developer_manual/figures/ng_5.5.pdf b/doc/developer_manual/figures/ng_5.5.pdf
	new file mode 100644
	index 0000000..0435138
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	diff --git a/doc/developer_manual/figures/ng_mean.pdf b/doc/developer_manual/figures/ng_mean.pdf
	new file mode 100644
	index 0000000..b4c4097
	Binary files /dev/null and b/doc/developer_manual/figures/ng_mean.pdf differ
	diff --git a/doc/developer_manual/figures/pJ.pdf b/doc/developer_manual/figures/pJ.pdf
	new file mode 100644
	index 0000000..4db6d25
	Binary files /dev/null and b/doc/developer_manual/figures/pJ.pdf differ
	diff --git a/doc/developer_manual/figures/ptBMin.pdf b/doc/developer_manual/figures/ptBMin.pdf
	new file mode 100644
	index 0000000..607cc20
	Binary files /dev/null and b/doc/developer_manual/figures/ptBMin.pdf differ
	diff --git a/doc/developer_manual/src/main_flow.asy b/doc/developer_manual/src/main_flow.asy
	new file mode 100644
	index 0000000..767463e
	--- /dev/null
	+++ b/doc/developer_manual/src/main_flow.asy
	@@ -0,0 +1,31 @@
	+import flowchart;
	+
	+usepackage("fourier");
	+
	+size(0, 400);
	+defaultpen(fontsize(8));
	+
	+pen code = font("T1", "DejaVuSansMono-TLF", "m", "n") + fontsize(6);
	+
	+block read = rectangle(Label("LHEF::Reader::readEvent", code), Label("read event"),(0,1));
	+block cluster = rectangle(Label("Event constructor", code), Label("perform jet clustering"), (0,0.5));
	+block resum = rectangle(Label("EventReweighter::reweight", code), Label("perform resummation"), (0,0));
	+block cut = rectangle(Label("Analysis::pass\_cuts", code), Label("apply cuts"),(0,-0.5));
	+block fill = rectangle(Label("Analysis::fill", code), Label("analyse"), (-0.3,-1));
	+block write = rectangle(Label("CombinedEventWriter::write", code), Label("write out event"), (0.5, -1));
	+
	+draw(read);
	+draw(cluster);
	+draw(resum);
	+draw(cut);
	+draw(fill);
	+draw(write);
	+add(new void(picture pic, transform t) {
	+ blockconnector operator --=blockconnector(pic,t);
	+ read--Down--Label("LHEF::HEPEUP", code)--Arrow--cluster;
	+ cluster--Down--Label("Event", code)--Arrow--resum;
	+ resum--Down--Arrow--cut;
	+ resum--Down--Label("Event", code)--Arrow--cut;
	+ cut--Down--Label("Event", code)--Left--Arrow--fill;
	+ cut--Down--Right--Arrow--write;
	+ });
	diff --git a/doc/developer_manual/src/ps_large_y.asy b/doc/developer_manual/src/ps_large_y.asy
	new file mode 100644
	index 0000000..a2c3cfa
	--- /dev/null
	+++ b/doc/developer_manual/src/ps_large_y.asy
	@@ -0,0 +1,27 @@
	+import graph;
	+
	+real goldenratio=(1+sqrt(5))/2;
	+size(4.5cm*goldenratio,4.5cm,IgnoreAspect);
	+
	+real ymin = -5;
	+real ymax = 5;
	+real phimin = 0;
	+real phimax = 2*pi;
	+
	+real yb = -4;
	+real phib = 1.76814;
	+real phif = 3.347;
	+real yf = 4.4;
	+real R = 0.4;
	+
	+fill((yb,phimin)--(yb,phimax)--(yf,phimax)--(yf,phimin)--cycle, blue+opacity(0.3));
	+fill(arc((yb, phib), R, -90, 90)--cycle, black + opacity(0.3));
	+fill(arc((yf, phif), R, 90, 270)--cycle, black + opacity(0.3));
	+draw(circle((yb, phib), R));
	+draw(circle((yf, phif), R));
	+filldraw(circle((-0.540897, 5.23749), R), black+opacity(0.3), black);
	+
	+xaxis(Label("$y$",0.5),YEquals(phimin),ymin,ymax);
	+xaxis(YEquals(phimax),ymin,ymax);
	+yaxis(Label("$\phi$",0.5),XEquals(ymin),phimin,phimax);
	+yaxis(XEquals(ymax),phimin,phimax);
	diff --git a/doc/developer_manual/src/ps_small_y.asy b/doc/developer_manual/src/ps_small_y.asy
	new file mode 100644
	index 0000000..50b2f87
	--- /dev/null
	+++ b/doc/developer_manual/src/ps_small_y.asy
	@@ -0,0 +1,42 @@
	+import graph;
	+
	+real goldenratio=(1+sqrt(5))/2;
	+size(4.5cm*goldenratio,4.5cm,IgnoreAspect);
	+
	+real ymin = -5;
	+real ymax = 5;
	+real phimin = 0;
	+real phimax = 2*pi;
	+
	+real yb = 0.647031;
	+real yf = 0.80701;
	+real yj = 0.758564;
	+real phib = 3.18605;
	+real phif = 4.05933;
	+real phij = 0.614849;
	+real R = 0.4;
	+
	+fill(
	+ (yb,phimin)--(yb,phimax)--(yf,phimax)--(yf,phimin)--cycle,
	+ blue+opacity(0.3)
	+ );
	+fill(
	+ (yb,phib-R)--(yb,phib+R)--(yf,phib+R)--(yf,phib-R)--cycle,
	+ black+opacity(0.3)
	+ );
	+fill(
	+ (yb,phif-R)--(yb,phif+R)--(yf,phif+R)--(yf,phif-R)--cycle,
	+ black+opacity(0.3)
	+ );
	+fill(
	+ (yb,phij-R)--(yb,phij+R)--(yf,phij+R)--(yf,phij-R)--cycle,
	+ black+opacity(0.3)
	+ );
	+draw(circle((yb, phib), R));
	+draw(circle((yf, phif), R));
	+draw(circle((yj, phij), R));
	+
	+xaxis(Label("$y$",0.5),YEquals(phimin),ymin,ymax);
	+xaxis(YEquals(phimax),ymin,ymax);
	+yaxis(Label("$\phi$",0.5),XEquals(ymin),phimin,phimax);
	+yaxis(XEquals(ymax),phimin,phimax);

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