Halo flux fraction plotted against the FWHM of the line in the halo (left) and halo/core FWHM ratio (right). The larger symbols indicate the six S/N_HALO >  10 objects. Spearman rank correlation coefficients ρ_s and corresponding p₀ values are shown in each panel. Open circles represent the objects for which the core/halo Lyα lines are not statistically different in terms of width, peak position and asymmetry parameter (see Sect. 5.4). See also Fig. A.2 for the relations between the spatial and spectral properties of the LAHs.