Reprint of Fig. 2 from Hale (1994), although excluding three wide systems without orbital solutions. Systems plotted with circles have known rotation periods from time series or calibrated activity indices. Systems plotted with diamonds have rotational velocities estimated from an average v sin i based on spectral class or by assuming a Skumanich relation calibrated with the Hyades and using age estimates from Ca II fluxes or simply assuming an age of 3 Gyr. See Hale (1994) for details.