diff --git a/FixedOrderGen/src/PhaseSpacePoint.cc b/FixedOrderGen/src/PhaseSpacePoint.cc
index 9e6e9b9..affdc09 100644
--- a/FixedOrderGen/src/PhaseSpacePoint.cc
+++ b/FixedOrderGen/src/PhaseSpacePoint.cc
@@ -1,670 +1,669 @@
 #include "PhaseSpacePoint.hh"
 
 #include <random>
 #include <algorithm>
 
 #include "RHEJ/Constants.hh"
 #include "RHEJ/kinematics.hh"
 #include "RHEJ/utility.hh"
 #include "RHEJ/exceptions.hh"
 
 #include "Process.hh"
 
 #include <CLHEP/Random/Randomize.h>
 #include <CLHEP/Random/RanluxEngine.h>
 
 using namespace RHEJ;
 
 namespace HEJFOG{
 
   static_assert(
       std::numeric_limits<double>::has_quiet_NaN,
       "no quiet NaN for double"
   );
   constexpr double NaN = std::numeric_limits<double>::quiet_NaN();
   RHEJ::UnclusteredEvent to_UnclusteredEvent(PhaseSpacePoint const & psp){
     RHEJ::UnclusteredEvent result;
     result.incoming = psp.incoming();
     std::sort(
         begin(result.incoming), end(result.incoming),
         [](Particle o1, Particle o2){return o1.p.pz()<o2.p.pz();}
     );
     assert(result.incoming.size() == 2);
     result.outgoing = psp.outgoing();
     assert(
         std::is_sorted(
             begin(result.outgoing), end(result.outgoing),
             RHEJ::rapidity_less{}
         )
     );
     assert(result.outgoing.size() >= 2);
     result.decays = psp.decays();
     result.central.mur = NaN;
     result.central.muf = NaN;
     result.central.weight = psp.weight();
     return result;
   }
 
   namespace{
     bool can_swap_to_uno(
         RHEJ::Particle const & p1, RHEJ::Particle const & p2
     ){
       return is_parton(p1)
         && p1.type != pid::gluon
         && p2.type == pid::gluon;
     }
 
     size_t count_gluons(std::vector<Particle>::const_iterator first,
       std::vector<Particle>::const_iterator last){
       return std::count_if(first, last, [](Particle const & p)
         {return p.type == pid::gluon;});
     }
 
     /** assumes FKL configurations between first and last,
      * else there can be a quark in a non-extreme position
      * e.g. uno configuration gqg would pass
      */
     bool can_change_to_qqx(
       std::vector<Particle>::const_iterator first,
       std::vector<Particle>::const_iterator last){
       return 1 < count_gluons(first,last);
     }
 
     bool is_AWZ_proccess(Process const & proc){
       return proc.boson && is_AWZ_boson(*proc.boson);
     }
   }
 
   void PhaseSpacePoint::maybe_turn_to_subl(
       double chance,
       Process const & proc,
       RHEJ::RNG & ran
   ){
     if(proc.njets <= 2) return;
     assert(outgoing_.size() >= 2);
 
     // decide what kind of subleading process is allowed
     bool allow_uno = false;
     const size_t nout = outgoing_.size();
     const bool can_be_uno_backward = can_swap_to_uno(
       outgoing_[0], outgoing_[1]
     );
     const bool can_be_uno_forward = can_swap_to_uno(
       outgoing_[nout-1], outgoing_[nout-2]
     );
     allow_uno = can_be_uno_backward || can_be_uno_forward;
 
     bool allow_qqx = false;
     if(is_AWZ_proccess(proc)) {
       allow_qqx = can_change_to_qqx(outgoing_.cbegin(), outgoing_.cend());
       if(incoming_[0].type == pid::gluon && incoming_[1].type == pid::gluon) {
         /// enforce qqx for initial gg
         allow_uno = false;
         chance = 1.;
       }
     }
 
     if(!allow_uno && !allow_qqx) return;
     if(ran.flat() < chance){
       weight_ /= chance;
       if(allow_uno && !allow_qqx){
           turn_to_uno(can_be_uno_backward, can_be_uno_forward, ran);
       } else if (!allow_uno && allow_qqx) {
         std::cout << "only qqx" << std::endl;
         turn_to_qqx(ran);
       } else {
         assert( allow_uno && allow_qqx);
         std::cout << "both qqx and uno" << std::endl;
         if(ran.flat() < 0.5) turn_to_uno(can_be_uno_backward, can_be_uno_forward, ran);
         else turn_to_qqx(ran);
         weight_ *= 2.;
       }
     } else weight_ /= 1 - chance;
 
   }
 
   void PhaseSpacePoint::turn_to_uno(
       const bool can_be_uno_backward, const bool can_be_uno_forward,
       RHEJ::RNG & ran
   ){
     if(!can_be_uno_backward && !can_be_uno_forward) return;
     const size_t nout = outgoing_.size();
     if(can_be_uno_backward && can_be_uno_forward){
       if(ran.flat() < 0.5){
         std::swap(outgoing_[0].type, outgoing_[1].type);
       } else {
         std::swap(outgoing_[nout-1].type, outgoing_[nout-2].type);
       }
       weight_ *= 2.;
     } else if(can_be_uno_backward){
       std::swap(outgoing_[0].type, outgoing_[1].type);
     } else {
       assert(can_be_uno_forward);
       std::swap(outgoing_[nout-1].type, outgoing_[nout-2].type);
     }
   }
 
   void PhaseSpacePoint::turn_to_qqx(RHEJ::RNG & ran){
     /// find first and last gluon in FKL chain
     auto first = std::find_if(outgoing_.begin(), outgoing_.end(),
       [](Particle const & p){return p.type == pid::gluon;});
     auto last = std::find_if(first, outgoing_.end(),
           [](Particle const & p){return is_quark(p) || is_antiquark(p);});
     const size_t ng = count_gluons(first,last);
     if(ng < 2)
       throw std::logic_error("not enough gluons to create qqx");
     // select flavour of quark
     const double r1 = 2.*ran.flat()-1.;
     weight_ *= n_f*2;
     int flavour = pid::down;
     for (double sum = 1./n_f; sum < std::abs(r1); sum += 1./n_f)
       ++flavour;
     flavour*=r1<0.?-1:1;
     // select gluon for switch
     first += floor((ng-1) * ran.flat());
     auto next = std::find_if(first+1, last,
       [](Particle const & p){return p.type == pid::gluon;});
     assert(next != outgoing_.end());
     weight_ *= (ng-1);
     first->type = ParticleID(flavour);
     next->type = ParticleID(-flavour);
   }
 
   template<class ParticleMomenta>
   fastjet::PseudoJet PhaseSpacePoint::gen_last_momentum(
       ParticleMomenta const & other_momenta,
       const double mass_square, const double y
   ) const {
     std::array<double,2> pt{0.,0.};
     for (auto const & p: other_momenta) {
       pt[0]-= p.px();
       pt[1]-= p.py();
     }
 
     const double mperp = sqrt(pt[0]*pt[0]+pt[1]*pt[1]+mass_square);
     const double pz=mperp*sinh(y);
     const double E=mperp*cosh(y);
 
     return {pt[0], pt[1], pz, E};
   }
 
   PhaseSpacePoint::PhaseSpacePoint(
     Process const & proc,
     JetParameters const & jet_param,
     RHEJ::PDF & pdf, double E_beam,
     double subl_chance,
     HiggsProperties const & h,
     RHEJ::RNG & ran
   )
   {
     assert(proc.njets >= 2);
     status_ = good;
     weight_ = 1;
 
     const int nout = proc.njets + (proc.boson?1:0);
     outgoing_.reserve(nout);
 
     // generate parton momenta
     const bool is_pure_jets = !proc.boson;
     auto partons = gen_LO_partons(
         proc.njets, is_pure_jets, jet_param, E_beam, ran
     );
     // pre fill flavour with gluons
     for(auto&& p_out: partons) {
       outgoing_.emplace_back(Particle{pid::gluon, std::move(p_out)});
     }
     if(status_ != good) return;
 
     if(proc.boson){
       switch (*proc.boson) {
       case pid::Higgs:{
         auto Hparticle=gen_boson(pid::higgs, h.mass, h.width, ran);
         auto pos=std::upper_bound(
             begin(outgoing_),end(outgoing_),Hparticle,rapidity_less{}
         );
         outgoing_.insert(pos, Hparticle);
         if(! h.decays.empty()){
           const int boson_idx = std::distance(begin(outgoing_), pos);
           decays_.emplace(
               boson_idx,
               decay_boson(outgoing_[boson_idx], h.decays, ran)
           );
         }
         break;
       }
       case pid::Wp:{
         /// @TODO implement, currently this is just a relabel Higgs
         ///@{
         std::cout << "Emission of Wp not implemented yet.\nThis is just a place holder" << std::endl;
         auto Hparticle=gen_boson(pid::Wp, h.mass, h.width, ran);
         auto pos=std::upper_bound(
             begin(outgoing_),end(outgoing_),Hparticle,rapidity_less{}
         );
         outgoing_.insert(pos, Hparticle);
         if(! h.decays.empty()){
           const int boson_idx = std::distance(begin(outgoing_), pos);
           decays_.emplace(
               boson_idx,
               decay_boson(outgoing_[boson_idx], h.decays, ran)
           );
         }
         ///@}
         break;
       }
       case pid::Wm:{
         /// @TODO implement, currently this is just a relabel Higgs
         ///@{
         std::cout << "Emission of Wm not implemented yet.\nThis is just a place holder" << std::endl;
         auto Hparticle=gen_boson(pid::Wm, h.mass, h.width, ran);
         auto pos=std::upper_bound(
             begin(outgoing_),end(outgoing_),Hparticle,rapidity_less{}
         );
         outgoing_.insert(pos, Hparticle);
         if(! h.decays.empty()){
           const int boson_idx = std::distance(begin(outgoing_), pos);
           decays_.emplace(
               boson_idx,
               decay_boson(outgoing_[boson_idx], h.decays, ran)
           );
         }
         ///@}
         break;
       }
       case pid::photon:
       case pid::Z:
       default:
         throw std::logic_error("Emission of boson of unsupported type");
       }
     }
     // normalisation of momentum-conserving delta function
     weight_ *= pow(2*M_PI, 4);
 
     reconstruct_incoming(proc, pdf, E_beam, jet_param.min_pt, ran);
     if(status_ != good) return;
     // set outgoing states
     most_backward_FKL(outgoing_).type = incoming_[0].type;
     most_forward_FKL(outgoing_).type = incoming_[1].type;
 
     maybe_turn_to_subl(subl_chance, proc, ran);
 
     if(proc.boson) couple_boson(*proc.boson, ran);
 
     #ifndef NDEBUG
     if(is_AWZ_proccess(proc)){
       // check that W has a quark to couple to
       auto const partons = filter_partons(outgoing_);
-      /// @TODO extend assert to also check flavour? Maybe easier in separate cmake test
       assert(partons.front().type != pid::gluon
         || partons.back().type != pid::gluon  // extremal quark
         || ( (partons.size() > 3 )            // or central qqx
           && ( 1<std::count_if(partons.cbegin()+1, partons.cend()-1,
                 [](Particle const & p) {return p.type != pid::gluon;})
               ))
       );
     }
     #endif
   }
 
   double PhaseSpacePoint::gen_hard_pt(
       int np , double ptmin, double ptmax, double y,
       RHEJ::RNG & ran
   ) {
     // heuristic parameters for pt sampling
     const double ptpar = ptmin + np/5.;
     const double arg_small_y = atan((ptmax - ptmin)/ptpar);
     const double y_cut = 3.;
 
     const double r1 = ran.flat();
     if(y < y_cut){
       const double pt = ptmin + ptpar*tan(r1*arg_small_y);
       const double temp = cos(r1*arg_small_y);
       weight_ *= pt*ptpar*arg_small_y/(temp*temp);
       return pt;
     }
 
     const double ptpar2 = ptpar/(1 + 5*(y-y_cut));
     const double temp = 1. - std::exp((ptmin-ptmax)/ptpar2);
     const double pt = ptmin - ptpar2*std::log(1-r1*temp);
     weight_ *= pt*ptpar2*temp/(1-r1*temp);
     return pt;
   }
 
   double PhaseSpacePoint::gen_soft_pt(int np, double max_pt, RHEJ::RNG & ran) {
     constexpr double ptpar = 4.;
 
     const double r = ran.flat();
     const double pt = max_pt + ptpar/np*std::log(r);
     weight_ *= pt*ptpar/(np*r);
     return pt;
   }
 
   double PhaseSpacePoint::gen_parton_pt(
       int count, JetParameters const & jet_param, double max_pt, double y,
       RHEJ::RNG & ran
   ) {
     constexpr double p_small_pt = 0.02;
 
     if(! jet_param.peak_pt) {
        return gen_hard_pt(count, jet_param.min_pt, max_pt, y, ran);
     }
     const double r = ran.flat();
     if(r > p_small_pt) {
       weight_ /= 1. - p_small_pt;
       return gen_hard_pt(count, *jet_param.peak_pt, max_pt, y, ran);
     }
     weight_ /= p_small_pt;
     const double pt =  gen_soft_pt(count, *jet_param.peak_pt, ran);
     if(pt < jet_param.min_pt) {
       weight_=0.0;
       status_ = not_enough_jets;
       return jet_param.min_pt;
     }
     return pt;
   }
 
   std::vector<fastjet::PseudoJet> PhaseSpacePoint::gen_LO_partons(
       int np, bool is_pure_jets,
       JetParameters const & jet_param,
       double max_pt,
       RHEJ::RNG & ran
   ){
     if (np<2) throw std::invalid_argument{"Not enough partons in gen_LO_partons"};
 
     weight_ /= pow(16.*pow(M_PI,3),np);
     weight_ /= std::tgamma(np+1); //remove rapidity ordering
     std::vector<fastjet::PseudoJet> partons;
     partons.reserve(np);
     for(int i = 0; i < np; ++i){
       const double y = -jet_param.max_y + 2*jet_param.max_y*ran.flat();
       weight_ *= 2*jet_param.max_y;
 
       const bool is_last_parton = i+1 == np;
       if(is_pure_jets && is_last_parton) {
         constexpr double parton_mass_sq = 0.;
         partons.emplace_back(gen_last_momentum(partons, parton_mass_sq, y));
         break;
       }
 
       const double phi = 2*M_PI*ran.flat();
       weight_ *= 2.0*M_PI;
 
       const double pt = gen_parton_pt(np, jet_param, max_pt, y, ran);
       if(weight_ == 0.0) return {};
 
       partons.emplace_back(fastjet::PtYPhiM(pt, y, phi));
       assert(jet_param.min_pt <= partons[i].pt());
       assert(partons[i].pt() <= max_pt+1e-5);
     }
     // Need to check that at LO, the number of jets = number of partons;
     fastjet::ClusterSequence cs(partons, jet_param.def);
     auto cluster_jets=cs.inclusive_jets(jet_param.min_pt);
     if (cluster_jets.size()!=unsigned(np)){
       weight_=0.0;
       status_ = not_enough_jets;
       return {};
     }
 
     std::sort(begin(partons), end(partons), rapidity_less{});
 
     return partons;
   }
 
   Particle PhaseSpacePoint::gen_boson(
       RHEJ::ParticleID bosonid, double mass, double width,
       RHEJ::RNG & ran
   ){
     // Usual phase space measure
     weight_ /= 16.*pow(M_PI, 3);
 
     // Generate a y Gaussian distributed around 0
     // TODO: magic number only for Higgs
     const double y = random_normal(1.6, ran);
     const double r1 = ran.flat();
     const double sH = mass*(
         mass + width*tan(M_PI/2.*r1 + (r1-1.)*atan(mass/width))
     );
 
     auto p = gen_last_momentum(outgoing_, sH, y);
 
     return Particle{bosonid, std::move(p)};
   }
 
   Particle const & PhaseSpacePoint::most_backward_FKL(
       std::vector<Particle> const & partons
   ) const{
     if(!RHEJ::is_parton(partons[0])) return partons[1];
     return partons[0];
   }
 
   Particle const & PhaseSpacePoint::most_forward_FKL(
       std::vector<Particle> const & partons
   ) const{
     const size_t last_idx = partons.size() - 1;
     if(!RHEJ::is_parton(partons[last_idx])) return partons[last_idx-1];
     return partons[last_idx];
   }
 
   Particle & PhaseSpacePoint::most_backward_FKL(
       std::vector<Particle> & partons
   ) const{
     if(!RHEJ::is_parton(partons[0])) return partons[1];
     return partons[0];
   }
 
   Particle & PhaseSpacePoint::most_forward_FKL(
       std::vector<Particle> & partons
   ) const{
     const size_t last_idx = partons.size() - 1;
     if(!RHEJ::is_parton(partons[last_idx])) return partons[last_idx-1];
     return partons[last_idx];
   }
 
   namespace {
     /// partons are ordered: even = anti, 0 = gluon
     ParticleID index_to_pid(size_t i){
       if(!i) return pid::gluon;
       return static_cast<ParticleID>(i%2?(i+1)/2:-i/2);
     }
 
     /// decides which "index" (see index_to_pid) are allowed for process
     std::bitset<11> switch_allowed(Process const & proc){
       std::bitset<11> allowed = ~0;
       allowed[0] = 0; // no gluon
       if(abs(*proc.boson) == pid::Wp){
         // special case W+2j:
         // Wp: anti-down or up-type quark -> 1001100110(0) = 1228
         // Wm: down or anti-up-type quark -> 0110011001(0) = 818
         allowed &= (*proc.boson)>0?1228:818;
       }
       return allowed;
     }
   }
 
   void PhaseSpacePoint::reconstruct_incoming(
       Process const & proc,
       RHEJ::PDF & pdf, double E_beam,
       double uf,
       RHEJ::RNG & ran
   ){
     std::tie(incoming_[0].p, incoming_[1].p) = incoming_momenta(outgoing_);
     // calculate xa, xb
     const double sqrts=2*E_beam;
     const double xa=(incoming_[0].p.e()-incoming_[0].p.pz())/sqrts;
     const double xb=(incoming_[1].p.e()+incoming_[1].p.pz())/sqrts;
     // abort if phase space point is outside of collider energy reach
     if (xa>1. || xb>1.){
       weight_=0;
       status_ = too_much_energy;
       return;
     }
     // pick pdfs
     /** @TODO
      *  ufa, ufb don't correspond to our final scale choice.
      *  The reversed HEJ scale generators currently expect a full event as input,
      *  so fixing this is not completely trivial
      */
     auto const & ids = proc.incoming;
     std::array<std::bitset<11>,2> allowed_partons{~0,~0};
     // special case A/W/Z+2j: needs one quark initially
     if(proc.njets == 2 && is_AWZ_proccess(proc)){
     // @TODO optimise: do not allow dd initial for Wp, also for 3j
       if(ids[0] != pid::gluon && ids[1] != pid::gluon){
         // both can be quarks => force one to be a gluon
         weight_*=2.;
         allowed_partons[ran.flat() < 0.5] = switch_allowed(proc);
       } else if(ids[0] == pid::gluon) {
         if(ids[1] == pid::gluon) {
           throw RHEJ::not_implemented{
             "W+2 jet process requires at least one initial quark"
           };
         }
         // first gluon -> second has to be quark
         allowed_partons[1] = switch_allowed(proc);
       } else {
         // second gluon -> first has to be quark
         allowed_partons[0] = switch_allowed(proc);
       }
     }
     for(size_t i = 0; i < 2; ++i){
       if(ids[i] == pid::proton || ids[i] == pid::p_bar){
         incoming_[i].type =
           generate_incoming_id(i, i?xb:xa, uf, pdf, allowed_partons[i], ran);
       } else {
         incoming_[i].type = ids[i];
       }
     }
     assert(momentum_conserved(1e-7));
   }
 
   RHEJ::ParticleID PhaseSpacePoint::generate_incoming_id(
       size_t const beam_idx, double const x, double const uf,
       RHEJ::PDF & pdf, std::bitset<11> allowed_partons, RHEJ::RNG & ran
   ){
     std::array<double,11> pdf_wt;
     pdf_wt[0] = allowed_partons[0]?fabs(pdf.pdfpt(beam_idx,x,uf,pid::gluon)):0.;
     double pdftot = pdf_wt[0];
     for(size_t i = 1; i < pdf_wt.size(); ++i){
       pdf_wt[i] = allowed_partons[i]?4./9.*fabs(pdf.pdfpt(beam_idx,x,uf,index_to_pid(i))):0;
       pdftot += pdf_wt[i];
     }
     const double r1 = pdftot * ran.flat();
     double sum = 0;
     for(size_t i=0; i < pdf_wt.size(); ++i){
       if (r1 < (sum+=pdf_wt[i])){
         weight_*= pdftot/pdf_wt[i];
         return index_to_pid(i);
       }
     }
     std::cerr << "Error in choosing incoming parton: "<<x<<" "<<uf<<" "
       <<sum<<" "<<pdftot<<" "<<r1<<std::endl;
     throw std::logic_error{"Failed to choose parton flavour"};
   }
 
   namespace {
     bool is_up_type(Particle const & part){
       return RHEJ::is_anyquark(part) && !(abs(part.type)%2);
     }
     bool is_down_type(Particle const & part){
       return RHEJ::is_anyquark(part) && abs(part.type)%2;
     }
   }
 
   void PhaseSpacePoint::couple_boson(
     RHEJ::ParticleID const boson, RHEJ::RNG & ran
   ){
     if(abs(boson) != pid::Wp) return; // only matters for W
 
     // find all possible quarks
     const int sign_W = boson>0?1:-1;
     std::vector<Particle*> allowed_parts;
     for(auto & part: outgoing_){
       // Wp -> up OR anti-down, Wm -> anti-up OR down
       if (   (sign_W*part.type > 0 && is_up_type(part))
           || (sign_W*part.type < 0 && is_down_type(part)) )
         allowed_parts.push_back(&part);
     }
     if(!allowed_parts.size()){
       /// @TODO do not allow such states in the generation
       status_=wrong_final_state;
       return;
     }
 
     // select one and flip it
     size_t idx = 0;
     if(allowed_parts.size() > 1){
       /// @TODO more efficient sampling
       idx = floor(ran.flat()*allowed_parts.size());
       weight_ *= allowed_parts.size();
     }
     allowed_parts[idx]->type =
       static_cast<ParticleID>( allowed_parts[idx]->type - sign_W );
   }
 
   double PhaseSpacePoint::random_normal(
       double stddev,
       RHEJ::RNG & ran
   ){
     const double r1 = ran.flat();
     const double r2 = ran.flat();
     const double lninvr1 = -log(r1);
     const double result = stddev*sqrt(2.*lninvr1)*cos(2.*M_PI*r2);
     weight_ *= exp(result*result/(2*stddev*stddev))*sqrt(2.*M_PI)*stddev;
     return result;
   }
 
   bool PhaseSpacePoint::momentum_conserved(double ep) const{
     fastjet::PseudoJet diff;
     for(auto const & in: incoming()) diff += in.p;
     for(auto const & out: outgoing()) diff -= out.p;
     return nearby_ep(diff, fastjet::PseudoJet{}, ep);
   }
 
   Decay PhaseSpacePoint::select_decay_channel(
       std::vector<Decay> const & decays,
       RHEJ::RNG & ran
   ){
     double br_total = 0.;
     for(auto const & decay: decays) br_total += decay.branching_ratio;
     // adjust weight
     // this is given by (channel branching ratio)/(chance to pick channel)
     // where (chance to pick channel) =
     //       (channel branching ratio)/(total branching ratio)
     weight_ *= br_total;
     const double r1 = br_total*ran.flat();
     double br_sum = 0.;
     for(auto const & decay: decays){
       br_sum += decay.branching_ratio;
       if(r1 < br_sum) return decay;
     }
     throw std::logic_error{"unreachable"};
   }
 
   std::vector<Particle> PhaseSpacePoint::decay_boson(
       RHEJ::Particle const & parent,
       std::vector<Decay> const & decays,
       RHEJ::RNG & ran
   ){
     const auto channel = select_decay_channel(decays, ran);
     if(channel.products.size() != 2){
       throw RHEJ::not_implemented{
         "only decays into two particles are implemented"
       };
     }
     std::vector<Particle> decay_products(channel.products.size());
     for(size_t i = 0; i < channel.products.size(); ++i){
       decay_products[i].type = channel.products[i];
     }
     // choose polar and azimuth angle in parent rest frame
     const double E = parent.m()/2;
     const double theta = 2.*M_PI*ran.flat();
     const double cos_phi = 2.*ran.flat()-1.;
     const double sin_phi = sqrt(1. - cos_phi*cos_phi);  // Know 0 < phi < pi
     const double px = E*cos(theta)*sin_phi;
     const double py = E*sin(theta)*sin_phi;
     const double pz = E*cos_phi;
     decay_products[0].p.reset(px, py, pz, E);
     decay_products[1].p.reset(-px, -py, -pz, E);
     for(auto & particle: decay_products) particle.p.boost(parent.p);
     return decay_products;
   }
 }
diff --git a/FixedOrderGen/t/W_2j_classify.cc b/FixedOrderGen/t/W_2j_classify.cc
index d65b954..9e7c2d8 100644
--- a/FixedOrderGen/t/W_2j_classify.cc
+++ b/FixedOrderGen/t/W_2j_classify.cc
@@ -1,105 +1,114 @@
 #ifdef NDEBUG
 #undef NDEBUG
 #endif
 
 #include "PhaseSpacePoint.hh"
 #include "Process.hh"
 #include "JetParameters.hh"
 #include "HiggsProperties.hh"
 
 #include "RHEJ/Mixmax.hh"
 #include "RHEJ/PDF.hh"
 #include "RHEJ/utility.hh"
 
 using namespace HEJFOG;
 using namespace RHEJ;
 
 
 namespace {
   void print_event(PhaseSpacePoint const & psp){
     std::cerr << "Process:\n"
       << psp.incoming()[0].type << " + "<< psp.incoming()[1].type << " -> ";
     for(auto const & out: psp.outgoing()){
       std::cerr << out.type << " ";
     }
     std::cerr << "\n";
   }
 
   void bail_out(PhaseSpacePoint const & psp, std::string msg){
     print_event(psp);
     throw std::logic_error{msg};
   }
 
   bool is_up_type(Particle const & part){
     return RHEJ::is_anyquark(part) && !(abs(part.type)%2);
   }
   bool is_down_type(Particle const & part){
     return RHEJ::is_anyquark(part) && abs(part.type)%2;
   }
 }
 
 int main(){
   constexpr size_t n_psp_base = 1337;
   const JetParameters jet_para{
     fastjet::JetDefinition(fastjet::JetAlgorithm::antikt_algorithm, 0.4), 20,5,30};
   PDF pdf(11000, pid::proton, pid::proton);
   constexpr double E_cms = 13000.;
   constexpr double subl_change = 0.5;
   const HiggsProperties higgs_para{125., 0.001,
     {Decay{{pid::photon, pid::photon},1.}}};
   RHEJ::Mixmax ran{};
 
   // W2j
   const Process proc {{pid::proton,pid::proton}, 2, pid::Wp};
   size_t n_psp = n_psp_base;
   size_t t_fail = 0;
   for( size_t i = 0; i<n_psp; ++i){
     const PhaseSpacePoint psp{proc,jet_para,pdf, E_cms, subl_change, higgs_para, ran};
     if(psp.status()==good){
       bool found_quark = false;
       bool found_anti = false;
-      auto out_partons = filter_partons(psp.outgoing());
+      std::vector<Particle> out_partons;
+      std::vector<Particle> Wp;
+      for(auto const & p: psp.outgoing()){
+        if(p.type == pid::Wp) Wp.push_back(p);
+        else if(is_parton(p)) out_partons.push_back(p);
+        else bail_out(psp, "Found particle with is not Wp or parton");
+      }
+      if(Wp.size() != 1 || out_partons.size() != 2){
+        bail_out(psp, "Found wrong number of outgoing partons");
+      }
       for(size_t j=0; j<2; ++j){
         auto const & in = psp.incoming()[j];
         auto const & out = out_partons[j];
         if(is_quark(in) || is_antiquark(in)) {
           found_quark = true;
           if(in.type != out.type) { // switch in quark type -> Wp couples to it
             if(found_anti){ // already found qq for coupling to W
               bail_out(psp, "Found second up/down pair");
             }
             found_anti = true;
             if( is_up_type(in)) { // "up" in
               // -> only allowed u -> Wp + d
               if(in.type < 0 || is_up_type(out) || out.type < 0){
                 // not in "q" or out "up" or out "qx" -> bail out
               bail_out(psp, "u -/> Wp + d");
               }
             } else { // "down" in
               // -> only allowed dx -> Wp + ux
               if(in.type > 0 || is_down_type(out) || out.type > 0){
                 // not in "qx" or out "down" or out "q" -> bail out
               bail_out(psp, "dx -/> Wp + ux");
               }
             }
           }
         }
       }
       if(!found_quark) {
         bail_out(psp, "Found no initial quarks");
       } else if(!found_anti){
         bail_out(psp, "Found no up/down pair");
       }
     } else { // bad process -> try again
       ++n_psp;
       if(psp.status()==wrong_final_state) ++t_fail;
     }
   }
   // @TODO test final state for 3j
 
   std::cout << "All processes passed.\nTook " << n_psp << " to generate "
     << n_psp_base << " successfully PSP (" << 1.*n_psp/n_psp_base << " trials/PSP)" << std::endl;
   std::cout << "Failed for wrong final state " << t_fail
     << " (" << 100.*t_fail/(n_psp-n_psp_base) << " % of fails)" << std::endl;
   return EXIT_SUCCESS;
 }