Small scaling factor introduced in order to match measured and calculated

fields.

diff --git a/STEER/AliMagFMapsV1.cxx b/STEER/AliMagFMapsV1.cxx
index d55230042ef456291776732aaed27c5efe65dd07..1f747c7c7502888e3bfb04dec2738c04bdd4d263 100644 (file)
--- a/STEER/AliMagFMapsV1.cxx
+++ b/STEER/AliMagFMapsV1.cxx
@@ -90,6 +90,7 @@ void AliMagFMapsV1::Field(Float_t *x, Float_t *b) const
     const Float_t kRmax2 = 500. * 500.;
     const Float_t kZmax  = 550.; 
     const Float_t kTeslaTokG = 10.;
+    const Float_t kScale = 0.98838; // matching factor
     
     // Check if position inside measured map
     Float_t r2 = x[0] * x[0] + x[1] * x[1];
@@ -104,8 +105,10 @@ void AliMagFMapsV1::Field(Float_t *x, Float_t *b) const
        b[2] *= kTeslaTokG;
     } else {
        AliMagFMaps::Field(x, b);
-       b[0] = - b[0];
-       b[2] = - b[2];
+       // Match to measure map
+       b[0] = - b[0] * kScale;
+       b[2] = - b[2] * kScale;
+       b[1] =   b[1] * kScale;
     }
 }