Distribution of photometric errors from measurements on the arbitrary z-band image with mean FWHM = 0.9″ for the set of photometric parameters (AUTO, APER, ISOCOR and DETMODEL) discussed in text (and also presented in Figs. 14 and 15). Light blue tracks represent the running median of the distributions. Very similar trends (not shown) were also found for the two extreme mean FWHMs (0.7″ and 1.1″).
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