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Fig. 4.

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H 3 + $ _{3}^{+} $ lines in d203-506. The label of each (centered) transition is indicated in the title of each panel, in the format Branch(J, G). In the bottom left panel, transitions with G = 0, 1, 2, and 3 are superimposed. Continuum-subtracted observational data are shown in black, centered on each H 3 + $ _{3}^{+} $ line. LTE models for H 3 + $ _{3}^{+} $ (blue), CH (orange), and other species (dotted magenta) are overplotted. H 3 + $ _{3}^{+} $ model has been vertically offset for clarity (see also Fig. B.1). The lower right panel shows the stacked H 3 + $ _{3}^{+} $ spectrum in velocity space (see Appendix B).

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