Fluxes produced by the models of McCammon and Lumb for point sources (extraction radius 5′′) on X-IFU. In black we plot the McCammon model, in red the Lumb model, and in green our modified version of the Lumb model. Differences in the line intensities above 0.2 keV are due to the choice of different models (apec and mekal can give different intensities), and to different pointing directions, solar cycle phase, and Earth positioning, as explained in Sect. 3.1.
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