Comparison of periods obtained here to periods obtained in the literature. First panel: Scholz et al. (2011, 40 stars in common); second panel: SuperWASP (Delorme et al. 2011, 39 stars in common); third panel: HATNet (Kovács et al. 2014, 151 stars in common); fourth panel: PTF (Agüeros et al. 2011, 29 stars in common). The gray lines are at 1-to-1, P/2, and 2P. Most of the periods match well (see the text).