def mass_3d_lens(self, r, theta_E, gamma, e1, e2):
        """
        computes the spherical power-law mass enclosed (with SPP routiune)
        :param r:
        :param theta_E:
        :param gamma:
        :param q:
        :param phi_G:
        :return:
        """
        return self.spp.mass_3d_lens(r, theta_E, gamma)