Evaluation of the photometric correction improvement. In the top panels the I/F_meas of the NAC image in orange filter of set 4 in Table 1 is plotted as an example as a function of emergence (left) and incidence (right) angles in a density slice plot. I/F_meas shows a linear dependence on both angles. The linear fit is overplotted. In the bottom panels the Akimov-photometrically corrected I/F_Acorr of the same image is plotted as a function of the same angles. The scatter is reduced now to only the intrinsic reflectance variations, and the linear dependence is corrected, being I/F_Acorr equally distributed at all incidence and emergence angles. The average value and ± σ scatter width is indicated by the solid and dashed lines, respectively. Colored contours indicate the density slices for values from 10 to 90 bins with intervals of 10. Angles bins are of 1° , while reflectance bins are of 0.001.