Lyα emission spectral properties (same as Fig. A.2) plotted against, from left to right: Lyα EW₀, the absolute UV magnitude, the UV continuum slope and the redshift of the host galaxy. The larger symbols indicate the six S/N_HALO >  10 objects. Spearman rank correlation coefficients ρ_s and corresponding p₀ values are indicated. Open circles represent the objects for which the core/halo Lyα lines are not statistically different (see Sect. 5.4).