Fig. 2
Equivalent width as a function of effective temperature and nitrogen abundance for several diagnostic lines. Colours, following the rainbow from red to purple, indicate nitrogen abundances εN ranging from 6.93 to 8.53 in steps of 0.4 dex. Negative values of Weq represent emission. For all models: log g = 3.9 (cgs), log Ṁ = −6 (M⊙/ yr) and ξm = 7 kms-1.
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