Joint fit of our Lyα luminosity functions and literature data with a double-Schechter model (grey solid lines in each panel). This is obtained by joining the best Schechter fit from Sobral et al. (2018a) at each redshift (green dashed lines in each panel) and a second Schechter function (coloured dashed-dotted lines). We jointly fit this double-Schechter model to both our data and those from literature leaving free the parameters of the second Schechter in order to constrain its faint-end slope α at each redshift.