Extraction of 80 × 80 arcsec of the CHEOPS field-of-view for two different data frames at the beginning (top) and the end (bottom) of the second visit (see Table 2). The TOI-178 PSF is shown at the centre, with the DEFAULT DRP photometricaperture represented by the dashed black circles. The telegraphic pixel location that appeared close to the end of the observation is marked by the red circle.