def METHOD_NAME(self, z_source, cosmo):
    """Scales the mass map integrals (with units of mass not convergence) into a
    convergence map for the given cosmology and source redshift and returns the
    keyword arguments of the interpolated reduced deflection and lensing potential.
    :param z_source: redshift of the source
    :param cosmo: astropy.cosmology instance
    :return: keyword arguments of the interpolation instance with numerically
        computed deflection angles and lensing potential
    """
    lens_cosmo = LensCosmo(z_lens=self._redshift, z_source=z_source, cosmo=cosmo)
    mpc2arcsec = lens_cosmo.dd * const.arcsec
    x_axes = self._x_axes_mpc / mpc2arcsec  # units of arc seconds in grid spacing
    y_axes = self._y_axes_mpc / mpc2arcsec  # units of arc seconds in grid spacing
    f_ = self._f_mass / lens_cosmo.sigma_crit_angle / self._grid_spacing**2
    f_x = (
        self._f_x_mass
        / lens_cosmo.sigma_crit_angle
        / self._grid_spacing**2
        * mpc2arcsec
    )
    f_y = (
        self._f_y_mass
        / lens_cosmo.sigma_crit_angle
        / self._grid_spacing**2
        * mpc2arcsec
    )
    kwargs_interp = {
        "grid_interp_x": x_axes,
        "grid_interp_y": y_axes,
        "f_": f_,
        "f_x": f_x,
        "f_y": f_y,
    }
    return kwargs_interp