def __init__(self, scaling, charges=None, dipoles=None, coordinates=None):
PairFF.__init__(self, scaling, coordinates)<EOL>self.charges = charges<EOL>self.dipoles = dipoles<EOL>
Initialize a CoulombFF object

           Arguments:
             scaling  --  symmetric NxN array with pairwise scaling factors.
                          When an element is set to zero, it will be excluded.

           Optio1nal arguments:
             charges  --  the atomic partial charges
             dipoles  --  atomic dipole moments
             coordinates  --  the initial Cartesian coordinates of the system,
                              which can be updated with the update_coordinates
                              method