Ratio of the expected SB due to undetected LAEs to the mean SB of detected diffuse emission, as a function of group ID for the high confidence groups. The blue plusses show the prediction for a fiducial LF with a faint-end slope of α = −1.84 (Herenz et al. 2019) extrapolated to zero luminosity. The other symbols show the predictions for steeper (α = −1.94) or shallower (α = −1.74) slopes as indicated on the plot. The red and green symbols show the result of the model when using a low-luminosity cut (L_min) of respectively 10³⁸ and 10³⁷ erg s⁻¹. The arrows show the amplitude of the multiplicative ζ correction that was included (see Sect. 5.2.1). The horizontal dotted lines display the 0.5 and 1.5 values.