Signal-to-noise ratios derived from phase-folded time series S/N_lc vs. those of the corresponding BLS spectra, S/N_sp, for simulations satisfying the frequency criterion, condition b in Sect. 2.3. The joint analysis (by using BLS3) is capable of boosting even those signals that are otherwise buried deep in the noise (i.e., have S ∕N_lc < 3.0 in the “H1 alone” standard BLS analysis).