Left: phase curves in r and i derived with the Lafler-Kinman algorithm after removal of the long-term trend via a piece-wise linear function. Overplotted is a least squares fitted sine function (blue); the χ² values are ~3.6 for the sine function and ~5.2 for a constant function at zero mag. Middle and right: light curves in the high state and the transition state after removal of the long-term trend via a piece-wise linear function. Overplotted on each light curve are fitted sine functions of period and amplitude as labeled. The χ² values are ~2.2 for the sine functions, and for a constant function at zero mag ~10 (middle) and ~4 (right). The middle panel also shows the UKIRT data of Varricatt et al. (2015); Z,Y,J,H, and K in magenta, cyan, green, blue, and yellow, respectively.