Light curves of an eclipsing binary that displays a series of discontinuities indicated by blue arrows. The colour code corresponds to the three colour light curves, with the resulting white light curve plotted in black. We note that the colour light curves have been shifted by a constant in order to avoid too large a scale on the y axis. The top inset is a magnification of a portion of the light curve where the discontinuity in flux is not a simple step but a sudden increase of the flux, followed by an exponential decrease as could be generated by the impact of a proton on the CCD.