Fig. 9
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Demonstration of the effect of point source colour on zeropoint calibration. X-axis shows the catalogue colour of sources, while the Y-axis shows the ø-band magnitudes minus their instrumental magnitude and image zeropoint. Red squares are binned magnitudes with error bars equal to the standard deviation of magnitudes in each bin. The solid black line shows the best fit using EMCEE (Foreman-Mackey et al. 2013). The lower panel shows the same points with the colour correction applied.
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