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Fig. 3


Comparison between photometric and spectroscopic redshifts in the A2744 (left) and M0416 (right) clusters. Filled circles represent best quality spectroscopic redshifts used to compute the photometric redshift accuracy reported in Table 1, empty circles objects with “reliable” redshift from the GLASS sample (quality flag = 3). Lower panels show the Δz/ (1 + zspec) = (zspeczphot) / (1 + zspec) as a function of zspec. The inset in each of the upper panels presents the relevant distribution of Δz/ (1 + zspec) with its average and rms after excluding | Δz/ (1 + zspec) | > 0.15 outliers, as discussed in the text. Red dashed lines in both panels enclose the | Δz/ (1 + zspec) | ≤ 0.15 region.

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