Mass uncertainty (upper panel) in the follow-up blind tests vs. the criterion defined in Dumusque et al. (2017); see Eq. 2 for the definition. We show the four masses: 1 M_Earth, (red), 2 M_Earth, (green), 3 M_Earth, (brown), and 4 M_Earth (orange). The 10% and 20% uncertainty levels are indicated. The lower panel indicates the limit in RV rms corresponding to a mass uncertainty of 20% for the four masses with three assumptions according to this criterion C: 1000 points and limit C depending on spectral type (solid lines), 1000 points and limit C equal to 10 for all spectral types (dashed lines), and 500 points and limit C depending on spectral type (dotted line).