Example of a LC interpreted as having two subcycles per cycle. Top panel: original LC. Medium panel: Lomb-Scargle periodogram showing the main peak (A) with a period of 6.75 days, and a second peak (B) with a period of 13.4 days. Bottom panel: phase diagram for a period of 13.453 days (adjusted to the highest amplitude and lowest dispersion), showing one full cycle with two subcycles and a harmonic fit depicted by the solid line.