Revert of a harmful change (A.Goel)

[u/mrichter/AliRoot.git] / TPC / AliTPCGGVoltError.cxx

diff --git a/TPC/AliTPCGGVoltError.cxx b/TPC/AliTPCGGVoltError.cxx
index 0c6e2e3b1b830aa89b0c57a5c460c278439ce628..27b47a105a28518b637cd322a1ec413f633ae350 100644 (file)
--- a/TPC/AliTPCGGVoltError.cxx
+++ b/TPC/AliTPCGGVoltError.cxx
@@ -14,24 +14,7 @@
  **************************************************************************/
 
 ////////////////////////////////////////////////////////////////////////////
-//                                                                        //
 // AliTPCGGVoltError class                                                //
-// The class calculates the electric field and space point distortions    //
-// due a Gating Grid (GG) Error voltage. It uses the exact calculation    //
-// technique based on bessel functions. (original code from STAR)         //
-// The class allows "effective Omega Tau" corrections.                    // 
-//                                                                        //
-// date: 27/04/2010                                                       //
-// Authors: Jim Thomas, Stefan Rossegger, Magnus Mager                    //
-//                                                                        //
-// Example usage:                                                         //
-//  AliTPCGGVoltError GGerror;                                            //
-//  GGerror.SetOmegaTauT1T2(0.32,1.,1.); // values ideally from OCDB      //
-//  GGerror.SetDeltaVGGA(50.);           // voltage offset A-side         //
-//  GGerror.SetDeltaVGGC(50.);           // voltage offset C-side         //
-//  GGerror.InitGGVoltErrorDistortion(); // initialization of the look up //
-//  // plot dRPhi distortions ...                                         //
-//  GGerror.CreateHistoDRPhiinZR(1.,100,100)->Draw("surf2");              //
 ////////////////////////////////////////////////////////////////////////////
 
 
@@ -147,7 +130,7 @@ void AliTPCGGVoltError::GetCorrection(const Float_t x[],const Short_t roc,Float_
   // Calculate correction in cartesian coordinates
   dx[0] = r * TMath::Cos(phi) - x[0];
   dx[1] = r * TMath::Sin(phi) - x[1]; 
-  dx[2] = 0.; // z distortion not implemented (1st order distortions)
+  dx[2] = 0.; // z distortion not implemented (1st order distortions) - see e.g. AliTPCBoundaryVoltError-class