Selection by size and apparent magnitude in F140W of our LSB galaxies. The panels show the different clusters. Red: LSB galaxies detected following our selection criteria and with a weight higher than 0.5. Blue and grey: samples from van Dokkum et al. (2015a) and Mobasher et al. (2001), both shifted to our observed redshift by accounting for an E+K correction (see Sect. 4). We plot curves of constant surface brightness, μ(r_eff, circ) = 24.0, 26.0 mag arcsec⁻² evolved from the Coma cluster redshift to the high-z clusters. Average error bars for our sample are shown.