Two properties of the Lyman α line plotted against EW₀ in Å (in logarithmic scaling). Top panel: peak separation (for objects with a double peaked Lyman α line) in km s⁻¹, bottom panel: FWHM of the main line (for all objects). The symbols are the same as in Fig. 13, the histograms to the right of the plots show again the distribution separated into the half with higher EW₀ (in green) and the half with lower EW₀ (in blue). The bin width for the histogram for the peak separation is 50 km s⁻¹, the bin width for the histogram for the FWHM is 100 km s⁻¹, the p-value is given based on a KS-test.