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How is the BDT separation value calculated

Hey all, I’m fairly new to TMVA so sorry if this is a basic question, I could not find the answer for this anywhere else.
I’m working with BDT and I am struggling to understand the output. At the end of the output log file, I am being told a Separation value and the corresponding significance. How is this separation value calculated. Is this just the value with the highest purity?

EDIT: Or is it just the value with the highest significance given by mvaeffs.C?

I am not sure exactly on which output and separation value you are referring to. Can you please elaborate more, quoting exactly the information that the algorithm provides to you

Thank you