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Fig. 14

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Comparison of measured instrumental magnitude and error using AutoPhOT, PSFex, SExtractor, and DAOPHOT. The upper two panels show the difference in recovered magnitude (left) using PSF-fìtting photometry, and the difference in error (right). Note, left and right panels have different y scales. The lower two panels show the same, but for aperture photometry. In each case, the x-axis gives the instrumental magnitude from AutoPhOT. The same aperture radius was used in the PSF and aperture cases. Error bars are the combination of uncertainties from both pipelines added in quadrature.

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