+ Double_t fSumDr; // Sum of Dr
+ Double_t fSumDr2; // Square of sum of Dr
+ Double_t fSumDr3; // Cube of sum of Dr
+ Double_t fSumDr4; // Fourth power of sum of Dr
+ Double_t fSumDFi; // Sum of DFi
+ Double_t fSumDFiDr; // Sum of DFiDr
+ Double_t fSumDFiDr2;// Sum of square of DFiDr
+ Double_t fSumDZ; // Sum of DZ
+ Double_t fSumDZDr; // Sum of DZDr
+ Double_t fSumDZDr2; // Sum of square of DZDr