Maximum projected size versus luminosity of the Lyα-CEN around J1538+08 (green star) and around quasars from the B16 (orange squares), Cai et al. (2019) (blue triangles) and Ginolfi et al. (2018) (purple cross) samples. The values for the ELANe (diamond symbols) detected by Cantalupo et al. (2014) (black), Hennawi et al. (2015) (red), Cai et al. (2017a) (green), and Arrigoni Battaia et al. (2018) (blue) are also included. WISSH quasars are marked with an additional red circle. We also report the two Lyα-CEN around the WISSH quasars from the AB19 sample, i.e. those with the lower luminosities. For these two Lyα-CEN, the maximum distance from the quasar spanned by the Lyα emission within the 2σ isophote multiplied by a factor of two is shown since AB19 do not report the values of the maximum projected size.