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 # Changelog for HEJ API
 
 This log lists only changes on the HEJ API. These are primarily code changes
 relevant for calling HEJ as an API. This file should only be read as an addition
 to [`Changes.md`](Changes.md), where the main features are documented.
 
 ## Version 2.1
 
 ### 2.1.0
 
 #### Changes to Event class
 * Restructured `Event` class
   - `Event` can now only be build from a (new) `Event::EventData` class
   - Removed default constructor for `Event`
   - `Event::EventData` replaces the old `UnclusteredEvent` struct.
   - `UnclusteredEvent` is now deprecated, and will be removed in HEJ Version
     2.3.0
   - Removed `Event.unclustered()` function
   - Added new member function `Events.parameters()`, to directly access
     (underlying) `Parameters<EventParameters>`
   - New member functions `begin_partons`, `end_partons` (`rbegin_partons`,
     `rend_partons`) with aliases `cbegin_partons`, `cend_partons`
     (`crbegin_partons`, `crend_partons`) for constant (reversed) iterators over
     outgoing partons.
 * New function `Event::EventData.reconstruct_intermediate()` to reconstruct
   bosons from decays, e.g. `positron + nu_e => Wp`
   - Only supports 1-boson or `WpWp` events.
-  - In the case of WpWp same-flavour reconstruction minimises total off-shell momentum.
+  - In the case of WpWp same-flavour the reconstruction will minimise the total
+    off-shell momentum.
 * Added optional Colour charges to particles (`Particle.colour`)
   - Colour connection in the HEJ limit can be generated via
     `Event.generate_colours` (automatically done in the resummation)
   - Colour configuration of input events can be checked with
     `Event.is_leading_colour`
 * Added function `Event.valid_hej_state` to check if event _could have_ been
   produced by `HEJ` according to the `max ext soft pt fraction` cut on the jets
 
 #### New and updated functions
 * Renamed `EventType::nonHEJ` to `EventType::non_resummable` and `is_HEJ()`
   to `is_resummable()` such that run card is consistent with internal workings
 * Made `MatrixElement.tree_kin(...)` and `MatrixElement.tree_param(...)` public
 * New `EventReweighter` member function `treatment` to query the
   treatment with respect to resummation for the various event types.
 * Added auxiliary functions to obtain a `std::string` from `EventDescription`
   (`to_string` for human readable, and `to_simple_string` for easy parsable
   string)
 * New `get_analyses` function to read in multiple `HEJ::Analysis` at once,
   similar to `get_analysis`
 * New `get_ew_parameters` function to extract electroweak parameters from
   YAML configuration.
 
 #### New classes
 * New class `Unweighter` to do unweighting
 * New class `CrossSectionAccumulator` to keep track of Cross Section of the
   different subprocess
 * New template struct `Parameters` similar to old `Weights`
   - `Weights` are now an alias for `Parameters<double>`. Calling `Weights` did
     not change
   - `Weights.hh` was replaced by `Parameters.hh`. The old `Weights.hh` header
     will be removed in HEJ Version 2.2.0
 * Function to multiplication and division of `EventParameters.weight` by double
   - This can be combined with `Parameters`, e.g.
     `Parameters<EventParameters>*Weights`, see also `Events.parameters()`
   - Moved `EventParameters` to `Parameters.hh` header
 * new class `EWConstants` replaces previously hard coded `vev`
   - `EWConstants` have to be set in the general `Config` and the
     `MatrixElementConfig`
 
 #### Input/Output
 * New abstract `EventReader` class, as base for reading events from files
   - Moved LHE file reader to `HEJ::LesHouchesReader`
 * New (optional) function `finish()` in abstract class `EventWriter`. `finish()`
   is called _after_ all events are written.
 * Support reading (`HDF5Reader`) and writing (`HDF5Writer`) `hdf5` files
 * New `BufferedEventReader` class that allows to put events back into
   the reader.
 * New `SherpaLHEReader` to read Sherpa LHE files with correct weights
 * `get_analysis` now requires `YAML::Node` and `LHEF::HEPRUP` as arguments
 * Replaced `HepMCInterface` and `HepMCWriter` by `HepMCInterfaceX` and
   `HepMCWriterX` respectively, with `X` being the major version of HepMC (2 or
   3)
   - Renamed `HepMCInterfaceX::init_kinematics` to `HepMCInterfaceX::init_event`
     and protected it, use `HepMCInterfaceX::operator()` instead
   - Removed redundant `HepMCInterfaceX::add_variation` function
 
 #### Linking
 * Export cmake target `HEJ::HEJ` to link directly against `libHEJ`
 * Preprocessor flags (`HEJ_BUILD_WITH_XYZ`) for enabled/disabled dependencies
   are now written to `ConfigFlags.hh`
 * Provide links to version specific object files, e.g. `libHEJ.so ->
   libHEJ.so.2.1 (soname) -> libHEJ.so.2.1.0`
 * Removed `LHAPDF` from public interface
 
 #### Miscellaneous
 * Capitalisation of `Config.hh` now matches class `Config` (was `config.hh`)
 * Replaced redundant member `EventReweighterConfig::jet_param` with getter
   function `EventReweighter.jet_param()` (`JetParameters` are already in
   `PhaseSpacePointConfig`)
 * Avoid storing reference to the Random Number Generator inside classes
   - Constructors of `EventReweighter` now expect `std::shared_ptr<HEJ::RNG>`
     (was reference)
   - Moved reference to `HEJ::RNG` from constructor of `JetSplitter` to
     `JetSplitter.split`
 
 ## Version 2.0
 
 ### 2.0.4
 
 * Fixed wrong path of `HEJ_INCLUDE_DIR` in `hej-config.cmake`
 
 ### 2.0.0
 
 * First release