eROSITA spectra of eRASSU J050810.4–660653 (top), RX J0501.6–7034 (middle), and eRASSt J044811.1–691318 (bottom) together with their best-fit models (as histograms). The respectively lower panels show the residuals from the best-fit model divided by the 1σ errors. For eRASSU J050810.4–660653, the simultaneous spectral fit to the spectra of the different epochs defined in Fig. A.1 is shown (epoch 1 marked in black, epoch 2 in red, epoch 3 in green, epoch 4 in blue, and epoch 5 in turquoise. For RX J0501.6–7034 the simultaneous fit to the spectra of eRASS1 (black), eRASS2 (red), eRASS3 (green), and eRASS4 (blue) is presented. Finally, the eRASS4 spectrum of eRASSt J044811.1–691318 is shown at the bottom.