Example of simulated light curve, drawn from and ⟨t_recur⟩∼10 h within their 10% scatter, and ⟨t_dur⟩∼1 h (from the relation in the bottom panel of Fig. A.1). An example of a successful (green points) and an unsuccessful (red) mock eROSITA scan is shown. The red line shows the eRASS sensitivity for bright states, the gray shows the threshold for faint states used in the simulations.