Distribution of the difference between the highest peak period and true period for all OGS configurations and all realisations with injected planet in the blind test (1266 points, 1 M_Earth), corresponding to a total of 5546 realisations. The middle panel is a zoom in the [−50d,50d] range. The lower panel shows the distribution of the periods found outside the [−50d,50d] range when a planet is injected (solid line), and when no planet is injected (dashed line).