AliESDVertex * ReadMeanVertexFromOCDB(Int_t runNb, const Char_t* type = "MeanVertex") { AliCDBManager *cdb = AliCDBManager::Instance(); cdb->SetDefaultStorage("raw://"); cdb->SetRun(runNb); AliCDBEntry *cdbe = cdb->Get(Form("GRP/Calib/%s", type)); AliESDVertex *vertex = (AliESDVertex *)cdbe->GetObject(); Double_t vmean[3], vsigma[3]; vertex->GetXYZ(vmean); vertex->GetSigmaXYZ(vsigma); printf("vertex in run %d: z_mean = %f, z_sigma = %f\n", runNb, vmean[2], vsigma[2]); return vertex; }