Power spectra obtained from the EPIC-pn data (0.2–8.0 keV). Top: pulsations from eRASSU J050810.4–660653 are clearly detected with a fundamental frequency of 0.0246 Hz corresponding to a period of 40.60 s together with signals at five harmonic frequencies. Middle: RX J0501.6–7034 shows pulsations with a frequency of about 57.7 mHz (17.3 s). Bottom: longest period is detected from eRASSt J044811.1–691318 at ∼784 s (frequency of 1.28 mHz).