+/****************************************************************/
+inline
+Double_t AliHBTPair::GetDeltaP() //return difference of momenta
+{
+ CalculateDiffs();
+ return TMath::Sqrt(fPxDiff*fPxDiff + fPyDiff*fPyDiff + fPzDiff*fPzDiff);
+}
+/****************************************************************/
+inline
+Double_t AliHBTPair::GetDeltaPx()
+ {
+ CalculateDiffs();
+ return fPxDiff;
+ }
+/****************************************************************/
+inline
+Double_t AliHBTPair::GetDeltaPy()
+ {
+ CalculateDiffs();
+ return fPyDiff;
+ }
+
+/****************************************************************/
+inline
+Double_t AliHBTPair::GetDeltaPz()
+ {
+ CalculateDiffs();
+ return fPzDiff;
+ }
+
+