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Fig. 4.

image

Differences between IGAPS and Pan-STARRS magnitudes (after taking out the raw per CCD median shift) versus Pan-STARRS colour. Data from the range 50° < < 70°, −5° < b <  +5° are shown. Top-left: Δg vs. (g − r), top-right: ΔrU vs. (g − r), bottom-left: ΔrI vs. (r − i), bottom-right: Δi vs. (r − i). Only stars with 14 <  gps <  20, 13 <  rps <  19, or 12.5 <  ips <  18.5 are used in these plots. The magenta line is the fitting line. The red dots follow the running median for each 0.05 mag bin showing where the trends deviate. The false colour scale indicates the density of the sources in each bin on a square-root scale with yellow representing the lowest density of at least four sources per 0.02 × 0.02 mag2 bin.

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