Distribution of optical KN brightness as a function of time for ET-detectable (assuming ETΔ) events in our NSNS (left column) and BHNS (right column) populations. The shaded regions contain 50%, 90%, and 99% of the KN light curves in the g (484 nm) band. Coloured circles show extinction-corrected AT2017gfo data rescaled to the median distance of the considered populations (upper limits are marked with a downward arrow, data from Villar et al. 2017). The bottom row shows the result restricted to binaries with ΔΩ_90% < 100 deg².