2D correlation map in flatfields at a 50 ke− level for a) CCD E2V-250 (channel 4, the channel on which spots illumination presented in the first section were done); b) DECam (CCD S11); and c) MegaCam. Row and column, respectively, correspond to label X and Y. An anisotropy between the amplitudes of the R0,1 and R1,0 coefficients is observed. For distance separations larger than 1 pixel, this anisotropy tends to vanish (RX,Y ≈ RY,X for X and Y > 1).
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