Fig. A.1

Distributions of counts for a 0.5 × 0.5 degrees masked image at the original pixel size of 0.396 arcsec in the five SDSS bands. The histograms in each band follow a normal distribution with a Gaussian shape. All bands own a similar zero point (Zp) of 28.3291 mag, as provided by the IAC Stripe 82 survey. We note the shallower z band evidenced by a wider distribution.
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