Theoretical 1D Lyα emission line (in velocity space) profiles obtained with the adopted (dust-free) shell model. The Lyα profiles (I) are normalized to the level of the continuum (I0). The maximum resolution profiles are shown as dashed lines. Solid lines correspond to VUDS resolution, R ~ 300. Upper row: we assumed different shell expansion velocities and three HI column densities, log(N_HI) = 19 (leftpanel), 20 (middle panel), and 21 (right panel). Lower row: we assumed different values of HI column density and three shell expansion velocities, V_exp = 50 (left panel), 200 (middle panel), and 300 (right panel) km s^-1.