Redshift distribution of ET BNS detected over 10 years and the corresponding theoretical KN at ∼12 hours after the merger. The background distribution in white corresponds to the parent BNS + KN population. The colored distributions correspond to the EM counterparts that are detectable with WST MOS blue or orange or red arm, different colors corresponding to different S/N intervals. EM counterparts detectable with Rubin are shown in grey. Black points refer to the y axis ticks on the right hand side and show the fraction of detectable (S/N > 3) EM counterparts, with no additional information on the S/N range, with respect to Rubin detections.