static Int_t BuildBasicFormulas(); //build list of basic formulas
static Double_t TPCscalingRPol(Double_t *xyz, Double_t * param);
static Double_t TPCscalingZDr(Double_t *xyz, Double_t * param);
+ static Double_t TPCscalingZDrGy(Double_t *xyz, Double_t * param);
static Double_t TPCscalingPhiLocal(Double_t *xyz, Double_t * param);
//
// TPC Field cage + ROC misalingment induced distortion