Kinematics of the detected Lyα nebulae: Velocity shift Δv_Lyα maps (left column) with respect to the Lyα peak wavelength of the nebula (see Fig. 2), and velocity dispersion σ_Lyα maps (right column) of the Lyα nebula around the three QSOs, computed from the first and second moment, respectively. The maps are smoothed as in Fig. 2. The moment calculation is performed only inside the 2σ isophote of each nebula. The positions of the LAE and SMG companion of the BR1202-0725 system are marked with a green and white cross, respectively. The side of the map is 20″ for BR1202-0725 and 10″ for G09-0902+0101 and G15-1444-0044. A scale bar is shown for each map. The gray circle in each map indicates the 1 arcsec² region used for the QSO’s PSF normalization, which is neglected in our analysis.