From 6501706612104fc15f3e0e9b4e01689bbb65f95f Mon Sep 17 00:00:00 2001
From: prino <prino@f7af4fe6-9843-0410-8265-dc069ae4e863>
Date: Thu, 14 Apr 2011 22:52:30 +0000
Subject: [PATCH] Fix in SDD correction maps for cases of negative drift length

---
 ITS/AliITSCorrMapSDD.cxx | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ITS/AliITSCorrMapSDD.cxx b/ITS/AliITSCorrMapSDD.cxx
index 81aa8ee30f2..3d5a7ab9cbe 100644
--- a/ITS/AliITSCorrMapSDD.cxx
+++ b/ITS/AliITSCorrMapSDD.cxx
@@ -67,6 +67,7 @@ void AliITSCorrMapSDD::ComputeGridPoints(Float_t z, Float_t x, AliITSsegmentatio
   if(bina>=nAnodesHybrid) bina-=nAnodesHybrid;
   Float_t stept = seg->Dx()*kMicronTocm/(Float_t)fNDriftPts;
   fDrLen= seg->Dx()*kMicronTocm-TMath::Abs(x);
+  if(fDrLen<0) fDrLen=0;
   Int_t bint = TMath::Abs((Int_t)(fDrLen/stept));
   if(bint==fNDriftPts) bint-=1;
   if(bint>=fNDriftPts){
-- 
2.43.0