Figure 4 shows the TB diurnal difference and altitude profile plotted as a function of latitude for the four craters. From Fig. 4, it can be seen that the peak-to-peak values of these four diurnal difference curves are about 20, 20, 20, and 5 K and the largest differences over the four craters are about , , , and , respectively. Compared with the latitude of the crater center, the latitudes of the trough of TB difference curves are shifted by a little to the warm area (the sunlit wall) inside the craters, due to the effect of surface tilts and the oblique incidence of the sun. The shifted degrees of these four TB difference curves are about 0.3, 0.4, 0.5, and 0.1 deg, which depend on the solar incident angle and the relative slope angle of the crater. Here, the position of the warm area inside the crater is estimated by the solar azimuth angle known from the MRM data files, e.g., the warm area is estimated to be at the northeast wall of crater Aristarchus (the latitude is higher than that of crater center), according to the position of the subsolar site, which is at the southwest of the crater, estimated by the solar azimuth angle (about 215 deg).