Projection onto Y axis

Newbie
2 
Double_t firstx = 53.5, lastx = 66.0;
Int_t firstxbin = h2d->GetXaxis()->FindFixBin(firstx);
Int_t lastxbin = h2d->GetXaxis()->FindFixBin(lastx);
TH1D *hpy = h2d->ProjectionY("_py", firstxbin, lastxbin, "");