diff --git a/Models/StandardModel/SMFFGVertex.cc b/Models/StandardModel/SMFFGVertex.cc
--- a/Models/StandardModel/SMFFGVertex.cc
+++ b/Models/StandardModel/SMFFGVertex.cc
@@ -1,72 +1,71 @@
 // -*- C++ -*-
 //
 // SMFFGVertex.cc is a part of Herwig - A multi-purpose Monte Carlo event generator
 // Copyright (C) 2002-2017 The Herwig Collaboration
 //
 // Herwig is licenced under version 3 of the GPL, see COPYING for details.
 // Please respect the MCnet academic guidelines, see GUIDELINES for details.
 //
 //
 // This is the implementation of the non-inlined, non-templated member
 // functions of the StandardModelFFGVertex class.
 //
 
 #include "SMFFGVertex.h"
 #include "ThePEG/Utilities/DescribeClass.h"
 #include "ThePEG/Interface/ClassDocumentation.h"
 #include "ThePEG/Persistency/PersistentOStream.h"
 #include "ThePEG/Persistency/PersistentIStream.h"
 #include "ThePEG/StandardModel/StandardModelBase.h"
 
 using namespace Herwig;
 using namespace ThePEG;
 
 // The following static variable is needed for the type
 // description system in ThePEG.
 DescribeNoPIOClass<SMFFGVertex,FFVVertex>
 describeHerwigSMFFGVertex("Herwig::SMFFGVertex", "Herwig.so");
 
 void SMFFGVertex::Init() {
 
   static ClassDocumentation<SMFFGVertex> documentation
     ("The SMFFGVertex class is the implementation of"
      "the coupling of the gluon to the Standard Model fermions");
   
 }
 
 // coupling for FFG vertex
 #ifndef NDEBUG
 void SMFFGVertex::setCoupling(Energy2 q2,tcPDPtr aa,tcPDPtr bb,tcPDPtr) {
 #else
 void SMFFGVertex::setCoupling(Energy2 q2,tcPDPtr aa,tcPDPtr,tcPDPtr) {
 #endif
   // first the overall normalisation
   if(q2!=_q2last||_couplast==0.) {
     _couplast = -strongCoupling(q2);
-    cerr << "testing coupling " << sqr(_couplast)/4./Constants::pi << "\n";
     _q2last=q2;
   }
   // the left and right couplings
   assert( abs(aa->id()) >= 1 && abs(aa->id()) <= 6 );
   assert( aa->id()==-bb->id());
   if(aa->id()<0)
     norm( _couplast);
   else
     norm(-_couplast);
   left(1.);
   right(1.);
 }
 
 SMFFGVertex::SMFFGVertex() : _couplast(0.), _q2last(ZERO) {
   orderInGs(1);
   orderInGem(0);
   colourStructure(ColourStructure::SU3TFUND);
 }
   
 void SMFFGVertex::doinit() {
   // PDG codes for the particles
   for(int ix=1;ix<7;++ix) {
     addToList(-ix,ix,21);
   }
   FFVVertex::doinit();
 }