Cumulative distribution function (CDF) of the S/N featured by MBHBs detected by 30-year SKA PTA. Blue, orange, and purple curves represent the CDF of all the models generated with e₀ = 0, 0.5 and 0.9, respectively. The lower panel presents the number of sources found with a given value of S/N for e₀ = 0.5 and e₀ = 0.9 models (orange and purple line) normalised with the same value found in the e₀ = 0 case.