RV half peak-to-peak difference, ΔRV∕2, as a function of log g, for our subsample of 101 single stars. Open circles stand for targets with a number of observations between two and eight, whereas filled circles represent the targets with at least nine observations. Red circles refer to the targets with spectroscopic log g measurements, whereas blue circles illustrate those with photometric measurements. The gray horizontal dashed line represents the 3× RV typicalerror level. The black solid line illustrates the linear fit of the data and the black dotted line is its 3× level. The planet-host candidates lie in the upper right region encompassed within the dashed and the dotted lines. The candidates with at least nine observations are labeled A to D. The red cross illustrates the residual for target D (IC 4651 9122) after removing the planet signal.