Getting the value of a point along x-axis in a histogram

Given a histogram with the X-axis representing a range of pT from 3.2 to 5,
At BinContent(3.2)=2000, BinContent(5)=2 (say)

I don’t want the BinContent rather I am interested in getting the value 3.2, how can I get it?

i.e. Pseudo Code :
similarly for

Is there a method like this?

virtual Double_t	GetBinLowEdge(Int_t bin) const