Scatter plots of the log(gf)_inv − log(gf)₀ (x-axis) versus ΔT_RMSD values (y-axis) for mode 2 (in blue) and mode 3 (in orange). Each subplot corresponds to one spectral line with the line number from Table 1 given in the lower-right corner. The values from each pixel are represented with different symbols: circle (umbra), square (penumbra), plus (granule), and cross (intergranule). Horizontal and vertical lines mark the average of ΔT_RMSD and log(gf)_inv − log(gf)₀ in each inversion mode, respectively. The values in the upper left corner of each panel are the mean and standard error of Δλ in mode 2, and in the upper right corner is the inferred Δλ in mode 3 in units of mÅ. The standard error of Δλ is zero in mode 3 since it retrieves a unique global value.