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Fig. 13
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Absolute difference in redshift between the foreground and background galaxies of the 31 grade 1 candidates with a ratio R (Eq. (3)) greater than 1.2. Purple blocks represent the PG + ELG (background + foreground) and blue blocks include all the other galaxy pairs (PG+PG, ELG+ELG, and ELG+PG).
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