Terminal wind speed V_wind as a function of the ratio B₀/f_tot for the full data set. The green dashed line corresponds to the curve (B₀/f_tot)^0.5 proposed by Suzuki (2006) normalised to an arbitrary coefficient for easier representation. The brown dashed and blue continuous lines represent the curves (B₀/f_tot)^0.1 and (B₀/f_tot)^2.2, which are empirical fits to the upper and lower envelopes of the data points (correspondingly, fast and slow wind limits; the curves are also normalised to arbitrary coefficients).