What are the parameters in the langaus.C?

ROOT
1

I want to use the code langaus.C written by H.Pernegger, Markus Friedl to fit my histogram. But I don’t know what the 4 parameters are in the function (gaus and landau), so I don’t now how to set the value and the range of parameters.
This is the code. ROOT: tutorials/fit/langaus.C File Reference
image

Look forward to your reply.

2

TMath::Landau + ROOT::Math::landau_pdf + CERNLIB G110 DENLAN
TMath::Gaus + Wikipedia → Gaussian function

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