Example of continuum adjustment for spectra 4 (top panel) and 5 (bottom panel). Data points with error bars: observed ratio of spectra 4 and 5 to the average spectrum in the representation of Eq. (2), same as in Fig. 6. Solid black line: cubic polynomial fit to R over the 0.4–3.2 keV band as described in the text. Solid green line: predicted R in the representation of Eq. (3) for component C, but added here to the continuum approximation given by the black line; dashed blue line: same for component D; dotted red line: same for component E; thick magenta line: components A–E combined.