HW Vir eclipses. Left: light curves of all eclipses acquired to check the timing precision of CHEOPS. These light curves can be used to measure the eclipse depth at different epochs. Bottom right: measured eclipse depth through the years. Data processed with DRP vl3. Note the decrease in the eclipse depth (2%) as the instrument ages. The hot pixels increase the flux in the aperture, so the eclipse is slightly diluted. Top right: same data processed with DRP vl4 where the dark current of the hot pixels is subtracted. The eclipse depth is stable through the years with a dispersion lower than 0.8%.