Evolution of the composite Lyα line profile (thin red line) as a function of the cone angle α in Fig. 19 (α = 15°, 30°, 40°, and 45°). This figure has been obtained by calculating the Lyα and UV radiative transfer inside the geometry shown in Fig. 19. The thick gray line shows the observed Lyα line of Mrk 1486 through the COS aperture. In the four captions we adopt the same physical parameters as in Table 7 and the intrinsic Lyα line is characterized by EW_int(Lyα) = 80 Å and FWHM_int(Lyα) = 150 km s^-1.