The top panel shows the histogram of binned radial-velocities for the sample. The sample peaks around 5 km s-1 and follows a Gaussian distribution. The lower panel shows the chromospheric activities as a function of radial-velocity and age on the right hand y-axis. Open circles are main sequence stars and filled red circles are the subgiant stars. Dashed lines bound the active, inactive and Vaughan Preston gap stars. We find an increase in the dispersion over the gap region of ~10 km s-1.
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