Sidereal rotation profile comparison between different layers of the Sun. The dot-dashed line indicates the photosphere rotation rate (Snodgrass & Ulrich 1990); the dashed line indicates the photosphere rotation rate according to Schou et al. (1998); the dotted line denotes the solar interior rotation rate at 0.71 R_⊙; the solid line is the rotation rate of the CHs; the plus signs are the rotation rates of the CHs in the northern hemisphere; and the cross signs are the rotation rates of the CHs in the southern hemisphere.