Fig. 1.
Upper panel: auxiliary response file (ARF) of ATHENA with 15 and 19 mirror rows. The blue curve is the ARF of ATHENA using an optical blocking filter; this can be used to block bright optical and UV sources. The green dotted curve is the ARF of ATHENA without an optical filter applied. The purple dashed curve is the 19 mirror rows ARF of ATHENA with an optical filter. Lower panel: vignetting function at different photon energy, which is determined by collimation imposed by the pore geometry in the SPO modules. These two figures are generated using the ATHENA calibration files version 1.7.0, which is publicly available online (see Dauser et al. 2019, for more details).
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