Comparison between the observed and inverted intensity maps. The grayscale maps represent the observations, while the blue intensity maps represent the inversion results. Panels (a)–(d): Set A observations at different wavelength positions, the first at the core of the Ca II line, the second and third columns at the cores of the Mg II h & k lines, and the fourth at the Ni I 281.4 nm line core. Panels (e)–(f): intensity maps from the inversions of set A at the same wavelength positions. Panels (i)–(l): same as panels (a)−(d) for set B. Panels (m)–(p): same as panels (e)−(h) for set B. For comparison purposes, the intensity range for each pair of observed/inverted intensity maps is the same.