Typical spectra obtained by variants of BLS applied on set H0+T0 of Table 1. The transit parameters are P_orb = 35.12345 d, δ = 0.003, q = 0.005, σ_H0 = 0.002, and σ_T0 = 0.0005. There is no gap between H0 and T0. Economic plotting is employed using 2000 frequency bins and plotting only the maxima in each bin. Increasing the number of fixed transit parameters (from the “all free” case of BLS0 to the “all fixed” case of BLS2) decreases the detection efficacy in this faint signal regime. However, the proposed optimum combination of BLS0 and BLS1 to BLS3 significantly increases the reliability of the detection.