Variation of the photometric flat-field corrections. 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 rms between all the determinations of the photometric grid corrections in a given photometric band. CCD boundaries are shown by white dotted lines. Note that all photometric correction maps are normalized to be zero at the center of the focal plane. As a consequence the rms across epochs is null at the center by construction. Noisy amplifiers are easily seen in rM and zM bands. In all bands (but i2M that was not available), the variation of response induced by the 2006 deposit of metal dust is clearly visible at the bottom right of the focal plane.
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