Observed and modeled 8.25-μm brightness temperature (T_B). 8.25 μm T_B for Obs. 18 (first two rows) and Obs. 27 (last two rows), plotted as a function of local time (first and third rows) or latitude (second and fourth rows). In each row, observational data (first column) are compared to a series of models. In the first column, the data are color-coded according to latitude (i.e., to equal values of the latitude difference from the sub-observer point) in the T_B vs local time plots, and according to local time in the T_B vs latitude plots. The following six column describe the six considered models, with the three options for the Bond albedos and inclusion or not of surface slopes (see text for details). In those panels, data are in black, models in red, and the data minus model difference in blue, with the 0 value indicated by the dashed line. Parameter values and rms of fit are indicated in each panel.