I am using TMVA Rectangular Cuts method.

Using TMVA::GUI I can see the optimal cut corresponding to maximal significance: S/sqrt(S + B).

But there it is supposed that there are 1000 signal events and 1000 background events which is not the case. How to get optimal cut according to my numbers of events. I can do it by hand but I want to do it from code.

By the way, why significance (the green line) is displayed as zero constant?

Another question is what weight per tree exactly means:

```
Double_t sigWeight = 1.0;
Double_t bkgWeight = 1.0;//bkgChain->GetEntries() / sigTree->GetEntries();
//And then
dataloader->AddSignalTree( sigTree, sigWeight );
dataloader->AddBackgroundTree( bkgChain, bkgWeight );
```

Will it solve my problem somehow?