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Fig. 1

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Difference between aperture and PSF photometry as a function of the SNLS tertiary standard star magnitude. The aperture photometry from B13 has been corrected for residual contamination using an estimate of the local background level obtained with PSF photometry. The magnitude range used in the zero-point fit (vertical dashed lines) is chosen so that the aperture catalog is expected to be free from selection bias (B13, Fig. 12).

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