+ AliTRDtrackingSector();
+ AliTRDtrackingSector(AliTRDgeometry* geo, Int_t gs);
+ virtual ~AliTRDtrackingSector(){;}
+
+ void Clear(const Option_t *opt = NULL);
+ Int_t GetNChambers() const { return fN; }
+ Double_t GetX(Int_t pl) const { return pl >=0 && pl < AliTRDgeometry::kNlayer ? fX0[pl] : 0.; }
+ AliTRDtrackingChamber* GetChamber(Int_t i) const { return i>=0 && i < fN ? fChamber[i] : NULL; }
+ AliTRDtrackingChamber* GetChamber(Int_t stack, Int_t plane, Bool_t build = kFALSE);
+ AliTRDtrackingChamber** GetStack(Int_t stack);
+ Int_t GetSector() const {return fSector;}