Int_t istk = fGeo->GetStack(c->GetDetector());
AliTRDpadPlane *pp = fGeo->GetPadPlane(ily, istk);
Float_t row0 = pp->GetRow0();
Int_t istk = fGeo->GetStack(c->GetDetector());
AliTRDpadPlane *pp = fGeo->GetPadPlane(ily, istk);
Float_t row0 = pp->GetRow0();