Histograms of detected emission lines as a function of wavenumber. The samples are limited to emission lines with a peak intensity 0.5−50 (upper panel) and 0.05−5 (lower panel). Each bin covers 1000 resolution elements based on a resolution of R = 100 000. In the lower panel, the dashed vertical line is located at 7750 cm^-1 and the sample is expected to be incomplete at higher wavenumbers (compare with Fig. 7). Data from discharge operated at MW power of 50 W.