I am using second moments as provided by the Stone analysis to define fragments and am concerned with the numeric prefactor.
I assume that the second moments resulting from the Stone analysis are defined by M2_XY=int X×Y×rho(R).
However, I am not completely sure how the qudrupole moments in the fragments are defined.
Usually the quadrupole moments are defined by M2_XY=int 3X×Y×rho(R), but in Firefly it seems that they are defined by M2_XY=int XY×rho(R), i.e. without the prefactor of 3.
Can anyone confirm this ?