Impact on the optical luminosity of the treatment for the power injection. We show the spectrum for the he6p00 model at 3100 d, characterized by a uniform volume filling factor of 10% and influenced by a magnetar power of 10³⁹ erg s⁻¹ treated either in the form of high-energy electrons (model “Pwr1e39”) or X-ray irradiation (model “Xray1e39”). The models have roughly the same power absorbed both in magnitude and deposition profile so only the nature of the power injected differs. [See Section 7 for discussion.]