- // Now we extrapolate this trackParam to chambers 6 -> 9
-
- const Float_t kFilterThickness = TMath::Abs(AliMUONConstants::MuonFilterZEnd()-AliMUONConstants::MuonFilterZBeg()); // cm
+ // add MCS effect in the iron wall
+ const Float_t kFilterThickness = AliMUONConstants::MuonFilterZEnd()-AliMUONConstants::MuonFilterZBeg(); // cm
+ AliMUONTrackExtrap::ExtrapToZCov(&trackParam, AliMUONConstants::MuonFilterZEnd()); // Extrap to iChamber
+ AliMUONTrackExtrap::AddMCSEffect(&trackParam, kFilterThickness, AliMUONConstants::MuonFilterX0()); // Add MCS effects