Non-LTE inversions of the spectral data and radiative losses in the upper chromosphere. Temperature, integrated radiative losses within the contribution function of the 3 mm continuum, longitudinal field strength, and transverse field strength at selected optical depths from the photosphere to the chromosphere are shown. The cyan contours correspond to T_b [3 mm] = 9 and 10 kK. The middle row shows example observed (markers) and fitted (solid lines) intensity of the λ6173 and λ8542 lines at three locations indicated by different markers overlaid on the other panels; the intensity is normalized by – the mean intensity at the bluest sampled wavelength of each line.