Parameters of linear fits for Eq. (3) to the brightness temperature excess density plots (as in Fig. 7). All combinations of spectral bands 3–10 and array configurations C1–C7 are given for the three selected regions, QS (upper row), FS (middle row), and FP (bottom row). The linear fits across the bins to the median values are indicated by the circles and to plus and minus one standard deviation are marked with plus and minus signs, respectively. Left column: μ, indicates the scalar shift of T_b, and the right column, κ, indicates the slope of the linear fit. The cases in which the most intense brightening instances are dominated by apparent brightening are marked with filled gray circles.