Upper panels: distribution of period (left) and mass (right) difference (between found and true period) for ΔT_spot1 (solid line) and ΔT_spot2 (dashed line) from blind tests A. The period plots are for the period corresponding to the highest peak in the periodogram (black) and fitted on the temporal series (red). Middle panels: median period and mass vs. spectral type. The true value is shown in green. The dotted lines in the period plot indicate the boundaries of the habitable zone we consider. Lower panels: distribution width (period difference and mass difference) vs. spectral type.