Photometric profile examples of events. Left: images of the events (50 × 50 pixels area). Right:corresponding profiles (18 × 18 pixels area) of the events. (a) Cosmic ray that hit the sensor almost perpendicularly producing a round PSF. (b) Cosmic ray hit, but this time with an impact angle that produced an elongated profile. (c) Validated impact flash. (d) Standard star used for the photometric calibration. The similarity in terms of FWHM is obvious for (c) and (d) (FWHM difference ~0.2 pixels), while a large difference is seen also between (a) and (c) (FWHM difference) ~1.5 pixels.