Convective turnover time for the LEGACY sample, τ_c, LEGACY. Left panel: quadratic fit using Eq. (9) as a function of (B − V) color as a solid black line, with the green shaded area representing the 1-σ credible region obtained from the Bayesian inference. The color coding shows the stellar metallicity reported by Lund et al. (2017). Right panel: details are similar to those of the left panel, but showing the result as a function of the Gaia (G_BP − G_RP) color, with the quadratic fit from Eq. (11) overlaid. Middle panel: comparison between τ_c, LEGACY and τ_c, N84 as obtained by means of the (B − V) color.