(fAODObjects->FirstLink())->SetObject(fHeader);
}
+ virtual Bool_t InitMagneticField() const {return fHeader ? fHeader->InitMagneticField() : kFALSE;}
+
// setters and getters for header information
void SetRunNumber(Int_t n) {if (fHeader) fHeader->SetRunNumber(n);}
void SetPeriodNumber(UInt_t n){if (fHeader) fHeader->SetPeriodNumber(n);}