Maps of photometric corrections (relative to the twilight flat-field). Each panel displays a low resolution map (36 × 36 super-pixels of 256 × 256 real pixels, i.e. a resolution of about 2′) of the corrections. Those corrections are determined on dithered observations of dense stellar fields in a given photometric band. Observations for the corrections displayed in uMgMrMiM and zM panels have been obtained during the same night in 2005 under remarkably stable atmospheric conditions. The i2M panel displays the result of an observation taken in 2008, about 1 year after the replacement of the iM filter. CCD boundaries are figured by white dotted lines.
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