Different combinations of baselines and periodicity shape found using the cosine kernel (ROC curves). The solid lines show sinusoidal light curves, and the dashed lines show sawtooth light curves. The blue lines show the PTF-like baseline, and the red lines show the idealised baseline. The circles and squares identify the points at the identified Bayes threshold for the sinusoidal and sawtooth cases, respectively. The blue markers show PTF-like light curves, and red markers show ideal light curves.