Comparison of the number of detections from the joint analysis by BLS3 (blue points) with those resulting from the standard BLS analysis of the secondary dataset H0 alone (yellow points). Spectrum S/N for the analysis by BLS3 on “H0+T0” is denoted by S/N_sp (3). The ordinate shows the ratio of the spectrum S/N values for “H0 alone” over “H0+T0”. Signal type a with 500 realizations was used.