Left: estimates of the planet-to-star radius ratio for the the HIPO blue observations; from left to right, more data points were neglected from the post-transit observations in steps of 5/10 points. The vertical red line indicates the end of egress, that is, neglecting more points would neglect in-transit data. This indicates that the upward post-transit trend seen in Fig. 4 has affected the measured transit depth. Right: comparison of the results obtained with our two different fitting approaches.