Distribution of the extent of the 90% sky localization region of GW-detected NSNS events (upper row) and BHNS events (lower row) that are capable of producing an EM counterpart, as a function of redshift. Different columns refer to ETΔ (first column), ET2L (second column), ETΔ+2CE (third column), and ET2L+2CE (four column). The solid line represents the median, while the coloured bands encompass the 50%, 90%, and 99% credible interval at each fixed redshift.