Fig. 7.
CLOUDY model illustrating the ionisation structure of an ideal ionisation-bound nebula surrounding a 2 Myr YSC of M = 104 M⊙ at the metallicity of NGC 7793. The radial variation in ionic fraction of H I (dashed black), O III (dashed purple), S II (solid green) and the S II/O III ratio (solid grey) are shown. The nebula consists of two main zones: an inner zone dominated by S III and O III, and an outer zone dominated by S II and O II.
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