Absolute magnitude difference between the galaxies in the pair, ΔMB (z) = |MB,2(z) − MB,1(z) |, as a function of redshift (thick green line). The letter in each panel refers to the companion galaxy in Fig. 4. The dashed lines mark the major merger limit, ΔMB = 1.5. The red solid lines mark the ΔMB computed with the absolute magnitudes estimated at the best photometric redshifts.
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