What do I need to rewrite in the analysis_HwU file, in order to analyze the 4tops?

Hello,

so I am trying to get differential distributions from the process : p p > t t~ t t~ [QCD] at fixed order. LO and NLO.

For this, I tried modifying the analysis file analysis_HwU_pp_ttxttx.f.

I suppose I have to define the momentum fractions, to get the transverse momenta here?
   xptq(i)
   xptb(i)

And then from them, I get the transverse momenta. Now I would need to calculate the invariant mass and the rapidities.

The problem is that I have never used Fortran and this code seems a little difficult right now.

Does anyone have any suggestions on what exactly I should rewrite? Or is there already an analysis file inside magraph for the 4tops I haven't found?

Best regards

Christian