Fig. A.3.

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Simulated incoming and detected photon fluxes by STIX and GOES/XRS. Top panel: Simulated incoming photon flux, before passing through the entrance windows, for a purely isothermal simulation (T = 14 MK and EM = 1047 cm−3), shown with the gray curve. Red, blue, and black lines represent, respectively, the corresponding detected photon fluxes of GOES/XRS 1-8 Å, GOES/XRS 0.5-4 Å, and STIX. The hatched area highlights the common area under the different curves, i.e., the photons jointly detected by STIX and GOES. Bottom panel: Actual observed STIX count spectrum. In this case, we do not make any distinction between the STIX imaging and spectroscopy spectra since at these energies (< 20 keV) there is no difference.

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