X-shooter spectrum of COLA1, shifted to rest-frame Lyα at z = 6.593 (green), compared to spectra of C-147 (red dashed line, a double peaked LAE at z = 2.23 confirmed through Hα emission, scaled to the peak flux in the red line; Sobral et al. 2018b). The profile of the red line in COLA1 resembles the Lyα profile of C-147 remarkably well. The blue component of COLA1 is cut at Δυ ≈ −250 km s⁻¹, and thus narrower than C-147, potentially due to a higher optical depth at large distance from COLA1.