A plot of the mos 2 data with model A and model B in the range 0.8 − 1.8 keV. The bottom part of the figure shows the relative error between model A and the data, while the dashed red line shows model B – model A. It is clear that model B follows the overall shape of the data better than model A. For example, model A shows a residual at  ~1.25 keV, whereas model B improves the fit of this region due to the Fe   xvii recombination edge at 1.26 keV.