Variations of the X-ray emission of HD 149404 with orbital phase. From top to bottom, the panels illustrate the full EPIC-pn count rates for the different observations and the observed fluxes evaluated over three different energy bands: soft (0.5–1.0 keV), medium (1.0–2.0 keV), and hard (2.0–4.0 keV). The magenta symbols in the second and third panels correspond to the fluxes measured on an archival ROSAT-PSPC spectrum (Rauw et al. 2001).