Halo flux fractions X_Lyα,h in relation to a) total Lyα luminosities; b) scale lengths of the UV continuum; and c) Lyα halo scale lengths. The green filled circles indicate the estimated corresponding Lyα halo fractions from Steidel et al. (2011), for Lyα-strong and Lyα-weak galaxies. The dotted lines in panel c) additionally show the upper limits on X_Lyα,h as a function of r_s,h estimated in Sect. 4.3 for the 5 objects with p₀> 0.05.