correct error parameterization for pad row cross

diff --git a/TRD/AliTRDseedV1.cxx b/TRD/AliTRDseedV1.cxx
index 0553c38a738215ae77ae7b8b5d73407672cd09b8..8ca2a6b6e1fe391b8270731a1a1ada49b3ddcae6 100644 (file)
--- a/TRD/AliTRDseedV1.cxx
+++ b/TRD/AliTRDseedV1.cxx
@@ -1160,7 +1160,10 @@ Bool_t AliTRDseedV1::Fit(Bool_t tilt, Bool_t zcorr)
     }
 
     fZfit[0] = .5*(zc[0]+zc[kNclusters-1]); fZfit[1] = 0.;
-    fS2Z     = 0.5+0.4*fZref[1]; fS2Z *= fS2Z;
+    // temporary external error parameterization
+    fS2Z     = 0.05+0.4*TMath::Abs(fZref[1]); fS2Z *= fS2Z;
+    // TODO correct formula
+    //fS2Z     = sigma_x*TMath::Abs(fZref[1]);
   } else {
     fZfit[0] = zc[0]; fZfit[1] = 0.;
     fS2Z     = GetPadLength()*GetPadLength()/12.;