def mass_3d(self, r, kwargs):
        """

        :param r: in arc seconds
        :param kwargs: lens model parameters in arc seconds
        :return: mass enclosed physical radius in kg
        """
        mass_dimless = self.model.mass_3d(r, kwargs)
        mass_dim = mass_dimless * const.arcsec ** 3 * self.cosmo.D_d ** 2 * self.cosmo.D_s \
                       / self.cosmo.D_ds * const.Mpc * const.c ** 2 / (4 * np.pi * const.G)
        return mass_dim
def mass_3d ( self , r , kwargs ) : mass_dimless = self . model . mass_3d ( r , kwargs ) mass_dim = mass_dimless * const . arcsec ** 3 * self . cosmo . D_d ** 2 * self . cosmo . D_s / self . cosmo . D_ds * const . Mpc * const . c ** 2 / ( 4 * np . pi * const . G ) return mass_dim
:param r: in arc seconds
        :param kwargs: lens model parameters in arc seconds
        :return: mass enclosed physical radius in kg