The phase evolution diagram over a time span of nearly four years for the residuals of KLCD. Color, from blue to red, indicates the surface brightness of the star from bright to dark, which is marked as the relative mag on the right Y-axis. Vertical white gaps correspond to time spans without Kepler data. Three yellow bands with lower brightness can be seen in one phase range of this diagram, which evolve gradually in time from left to right. The gray dashed lines are drawn to show the phase clearly.