The impact on the Cycle 1 P_rot distribution of requiring a minimum power when validating P_rot measurements. The left panel shows a histogram of the periodogram powers for the Cycle 1 light curves; the orange bins correspond to powers below the 30th percentile for this dataset (0.05 in this case). The right panel shows the full distribution of Cycle 1 P_rot, with the values drawn from measurements with a power below the 30th percentile indicated with orange crosses. Those low-power measurements include many outliers, such as the K stars with P_rot > 10 days or <1 day, and other problematic measurements, such as the strip of ≈3 days P_rot across the observed color range.