Number of candidates (N_cand) within the sky-localization area depending on the S/N of the detected CGW source. Green circles correspond to the total number of galaxies with M_∗ > 10^10.3 M_⊙ within the detection area (N₁₀₀). Blue and orange circles represent the same thing, but only including the galaxies contributing 90% and 50% of the total probability of being the true host. To improve the plot clarity, orange points have been shifted by a factor of 0.5. The gray line corresponds to the expected 1/(S/N)² relation.