Fig. 8.
Photometric illumination correction of the weak-lensing THELI data: Flat-fielded OmegaCAM data show systematic zeropoint variations over the field-of-view if the complete mosaic is calibrated with a single photometric zeropoint (left panels). The residuals can well be fitted and corrected with a two-dimensional, second-order polynomial over the field-of-view (right panels).
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