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Fig. 1

image

Illustration of the background residual correction, showing a 15′ × 15′ part of the PSZ2 G048.21-65.00 z-band stack before (left panel), and after (right panel) the correction. The median improvement in the effective depth of the z-band images in a 2′′ aperture is approximately 0.4 mag.

This figure is made of several images, please see below:

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