Spectral evolution between 1000 Å and 1 μm and from 500 to 4000 d for model he12p00 under the influence of a magnetar power of 10³⁹ erg s⁻¹ and dV of 2000 km s⁻¹ at all times. All spectra are normalized to a maximum flux of unity at each epoch. Contributions by species (e.g., those associated with oxygen include contributions from O I, O II, and O III) are indicated with a colored shading. Identification of the main lines is provided in the top panel (in case of multiple contributors, the strongest one is given). [See Section 5.1 for discussion.]