Expected properties of CGWs as a function of frequency. Top panel: free spectrum violin plot comparing the measured signal (orange) to the power distribution of CGWs (green). Empty violins show the full GWB produced by the models for comparison. Bottom panel: the probability of detecting a CGW with S/N > 3 as a function of frequency (green circles, left y-axis scale). The average S/N of CGWs is also shown as red crosses (right y-axis scale).