Angular separation θ as a function of redshift. The solid lines mark the measured angular separation of the close pairs, θ = 7.36″ in panel a) and θ = 10.46″ in panel b). The letter in each panel refers to the companion galaxy in Fig. 4. The grey area marks the angular separations between θmin (z) and θmax (z) (red dashed lines). The vertical dashed lines mark the redshift range under study, 0.4 ≤ z< 1. The redshifts at which the angular mask ℳθ is equal to one are marked with the thick green line.
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