// 3d.) profiles:
TProfile2D *fReferenceFlowGenFun; // all-event average of the generating function used to calculate reference flow
TProfile *fQvectorComponents; // averages of Q-vector components (1st bin: <Q_x>, 2nd bin: <Q_y>, 3rd bin: <(Q_x)^2>, 4th bin: <(Q_y)^2>)
// 3d.) profiles:
TProfile2D *fReferenceFlowGenFun; // all-event average of the generating function used to calculate reference flow
TProfile *fQvectorComponents; // averages of Q-vector components (1st bin: <Q_x>, 2nd bin: <Q_y>, 3rd bin: <(Q_x)^2>, 4th bin: <(Q_y)^2>)