Standard deviation of the relative CCD zero points for each exposure in the survey. Black dots denote exposures that were excluded from the average because of cuts on the stability of the observing conditions or on the uniformity of the effective instrument response. Exposures are ordered by increasing observation date. The vertical gray dotted lines indicate the separation between different MegaCam runs (roughly one run per lunation). The twilight flat-field is common to all observations in a run. The vertical red lines indicate significant changes to the telescope. The letters refer to the events described in Table A.1. In this figure, the same photometric flat-field correction, determined from observations on 2005-10-09 (black vertical line), is applied to all the observations.
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