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Fig. A.1.
Mean R-band S/N in different photometric apertures defined in terms of the FWHMeff, for objects in nine different magnitude bins at 22.0 ≲ R ≲ 26.5 (from top to bottom). The 24.0 ≲ R ≲ 24.5 and the 24.5 ≲ R ≲ 25.0 bins where the bulk of our sources are found are shown as red filled squares.
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