Top: observed CND spectrum. Middle: best-fit multiphase model spectrum (red). Bottom: residuals (observation minus model) as a function of wavelength. The observed spectrum is extracted over the whole CND field of view (extraction and processing in Section 2.2); the model is the best-fitting simulation from Section 4.2, using the abundances of Table 2 and the phase weights of Fig. 6. Line identifications are shown above the model panel: the most significant lines predicted by the model are marked (see Section 4.4); when multiple transitions fall within the same spectral bin, only the brightest is labeled here. The complete identification is provided in Table 3. The y axes of the observation and model spectra are shown on a square-root scale to enhance the visibility of faint features. The two curves are nearly indistinguishable over most of the range; a zoom highlighting fainter features is shown in Fig. B.1 (Appendix B).