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Fig. 7.

image

Residuals of the comparison between the final ISL and the (J0660ins − r)0 + ΔJ0660atm colour as a function of the (X, Y) position of the source on the CCD. Upper left panel: stacked residual map of all the J-PLUS DR1 pointings. Upper right panel: stacked residual map after applying the plane correction estimated pointing-by-pointing. Lower left panel: residual map of the pointing pid = 00315. The median residuals with respect to the instrumental stellar locus in 16 regions (4 × 4 grid, dotted lines) covering the CCD (coloured circles) are fitted with a plane (coloured squares). The direction of maximum variation is shown with the arrow. Lower right panel: median differences after applying the plane correction.

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