Three-dimensional figures of cooling front propagation (lower panels) and corresponding light curves (upper panels) of the simulation displayed in figure 10. (Left) Time evolution of the disk temperature from 278.5 to 291 d per 0.5 d. The corresponding time period in the lower panel is represented by the blue line in the upper light curve. (Right) Detailed version of a part of cooling front propagation. The time evolution of the disk temperature from 284.4 to 289 d per 0.1 d and the corresponding light curve.