Comparisons of spectral models with the dip (grey) and bright (yellow) spectra. The red line is the best-fit model to the earlier Chandra spectrum on day 6.3 (Orio et al. 2020), folded through the RGS response, and one can see that it has more hard emission and less soft emission than the dip spectrum on day 18.12. The blue line indicates the SPEX model for the dip spectrum, see Sect. 4.3.1 for discussion.