A histogram of the relative differences between the rotational periods derived in this work and those previously derived by McQuillan et al. (2014) for targets with SNR > 10 appearing in both works. Differences are in the sense of P − P_McQuillan, and the standard deviation of the central peak is 6.9%. The secondary peak is due to stars for which our period is twice as long as that reported by McQuillan et al. (2014); see text for further discussion.