Relation between single-measurement RV precision, σ_RV, and T_eff (left) and v sin(i) (right). Stellar ages are colour-coded. Stars marked as triangles do not have significant IR excess (see Sect. 3.1). Horizontal dashed-dotted lines mark the anticipated threshold value for the RV precision of σ_RV = 50 m s−1 for our longer-term survey (Sect.4.1). Vertical dashed-dotted lines indicate the values of T_eff = 6400 K (left panel) and v sin(i) = 40 km s−1 (right panel), above which many target are no longer compatible with our σ_RV ≤ 50ms−1 single-measurement RV-precision goal. The vertical dotted line on the right panel marks the lower sensitivity limit (3 km s−1) of our v sin(i) measurements (Sect. 6.1). The light-blue dashed lines in the right panel show the best linear fits to the correlation between v sin(i) and log(σ_RV) for v sin(i) ≤ 40 km s−1 and v sin(i) ≥ 40 km s−1.