Mass limits computed from the archival RV data using a bootstrap method (straight lines, following Bonfils et al. 2013 and references therein). The shadowed regions indicate the HZs (same colour-coding as for the mass limits). The targets have been split into two plots for ease of reading. The available RV data would allow us to detect planets in the HZ with minimum mass m_p sin(i) = 1−30 M_⊙, depending on the target. Everything above the mass limits should have been detected. See Sect. 3.2 for details.