X-ray light curves in 0.2–10.0 keV band of β Cep-type variables binned by 1000 s. The count rate of ξ¹ CMa is at least an order of magnitude higher than for the other stars. The horizontal axis shows the time after the start of the observation. Vertical bars represent 1σ errors. From top to bottom: the EPIC PN light curve of ξ¹ CMa; the HETG (added +1 and −1order) light curve of β Cru, where the lower red light curve is in the hard band (1.0−10.0 keV) where the detection of pulsations was claimed by Cohen et al. (2008); LETG (added +1 and −1 order) light curve of α Vir; EPIC PN light curve of κ Sco.