Panel a: distribution of χ² (minimized over t₀, d) obtained by phase-folding the light curve of K2-110 b over different trial periods. Panel b: signal residue for the best fitting periods throughout the parameter space. Panel c: raw signal detection efficiency (black line) and walking median (red line). Panel d: signal detection efficiency used by TLS. This is the result of the division of the raw SDE by its walking mean in panel c.