151 × 151 pixel inset, centred on Venus, of the ingress image. The edge of the Venusian disc (as given by the point of inflexion on Î_r) and of the solar disc are indicated by the red and green contours respectively. They do not coincide with the apparent boundaries due to the low grey scale saturation level. The grey scale is saturated at 3000DN/s (~5% of the mean photospheric level at disc centre) to allow the aureole, the bright arc on the part of the Venusian disc outside the solar disc, which is much dimmer than the solar disc, to be visible. The blue lines mark the minor sector within which the intensity of the aureole is relatively stable with azimuth. The bright feature on the northwest quadrant of the Venusian disc is an artefact of cosmic ray hits on the CCD.