Same as Fig. 3. Panel a: A close pair at z = 3.43 in the UDF-Mosaic with the primary galaxy showing a strong Lyα emission, compared to its companion, which has a much fainter Lyα emission. The two galaxies are separated with a projected distance of r_p ~ 22 kpc and a difference in velocity of Δv ~ 49 km s^-1. Panel b: At z = 5.76, this close pair of LAE is the highest redshift pair of our sample, located in the HDF-S with r_p ~ 19 kpc and Δv ~ 16 km s^-1.