Phases of the minima for period . Red dots: primary minima from CF; red pluses: primary minima from CPS; blue points: secondary minima from CF; blue crosses: secondary minima from CPS; orange circles: minima from DI; and bold green vertical lines denote the epochs of possible flip-flop events. The black bars with the numbers correspond to the photometric observing seasons, the numbers on top of the figure mark the observing seasons of DI.