/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_7/src/RecoTracker/TkMSParametrization/src/PixelRecoUtilities.cc

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#include "RecoTracker/TkMSParametrization/interface/PixelRecoUtilities.h"
#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "MagneticField/Engine/interface/MagneticField.h"
#include "MagneticField/Records/interface/IdealMagneticFieldRecord.h"

namespace PixelRecoUtilities {
  FieldAt0::FieldAt0(const edm::EventSetup& es) {
      edm::ESHandle<MagneticField> pSetup;
      es.get<IdealMagneticFieldRecord>().get(pSetup);
      fieldInInvGev = 1.f/std::abs(pSetup->inTesla(GlobalPoint(0,0,0)).z()  *2.99792458e-3f);
    }

}