def density(self, r, amp, sigma, e1, e2):
        """

        :param r:
        :param amp:
        :param sigma:
        :return:
        """
        return self.spherical.density(r, amp, sigma)
def density ( self , r , amp , sigma , e1 , e2 ) : return self . spherical . density ( r , amp , sigma )
:param r:
        :param amp:
        :param sigma:
        :return: