Eclipse profile of OV Boo at X-ray (top) and UV (bottom) energies. The original data from EPIC-pn and the OM were binned with 4 s time resolution and phase-averaged using 1000 phase bins per orbital cycle. The dashed vertical lines indicate the eclipse length of 151 s measured from the OM data shifted by 2 s toward a later phase in agreement with the updated ephemeris (see Fig. 2). The vertical blue ticks in the upper panel indicate arrivals of individual photons (pn, MOS1, and MOS2); the red ticks are the same events reflected about ϕ = 0.0 (corrected for the 2 s offset) to highlight asymmetries in the X-ray eclipse. The curves in the lower panel shown in blue are WD plus spot models whose parameters are explained in the text.