Hi Marco, for the NLO+PS there are also these changes needed in srcPythia8: diff -r ../Template/NLO/MCatNLO/srcPythia8/Pythia8.cc MCatNLO/srcPythia8/Pythia8.cc 24c24 < void pyabeg_(int&,char(*)[50]); --- > void pyabeg_(int&,char(*)[80]); 33c33 < char cwgtinfo_weights_info[1024][50]; --- > char cwgtinfo_weights_info[1024][80]; diff -r ../Template/NLO/MCatNLO/srcPythia8/Pythia82.cc MCatNLO/srcPythia8/Pythia82.cc 25c25 < void pyabeg_(int&,char(*)[50]); --- > void pyabeg_(int&,char(*)[80]); 34c34 < char cwgtinfo_weights_info[1024][50]; --- > char cwgtinfo_weights_info[1024][80]; With these changes, I have checked that the final plot_PYTHIA8_*.HwU is ok. Best, Ioannis > On 27 Nov 2020, at 14:44, marco zaro