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Fig. 20

image

Uncertainty on the MegaCam i-band normalisations, relative to the r-band, as a function of the number of calibration runs. The uncertainty level actually depends on how we interpret the NIST error budget colour uncertainty (black line) or gray scale uncertainty (dashed red line) – see Sect. 5.3 for details. The grey lines show the calibration uncertainties obtained with an optimised filter sampling (see Appendix A).

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