Box-and-whisker plots of the number of identified two-signal candidate resonances or the number of identified robust two-signal candidate resonances (defined by Eq. (9)), grouped by the pseudo-classes defined in this work: low and high f_sv. Left panel: box-and-whisker plot of the number of identified two-signal candidate resonances. The colour depicts the pre-whitening strategy employed to generate the light curve models. Right panel: box-and-whisker plot of the number of identified robust two-signal candidate resonances. Whiskers and outliers for both panels are indicated in a similar way to how they are indicated in Fig. 5.