KN light curves for the g (top) and i (bottom) filters. These light curves were generated from BNS merger fiducial populations, Gaussian NS mass distribution, and the BLh (left) and APR4 (right) EOSs. The plotted light curves are associated with BNS mergers detectable by ET reference design with a sky localisation accuracy better than 100 deg². The solid, dashed, and dash-dot black lines mark the 50%, 90%, and 99% probability distributions of the light curves.