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Fig. 8
Dependence of N ivλ4058/N iiiλ4640 on nitrogen abundance, for three different background metallicities: Galactic (upper panel), LMC (middle panel), and SMC (lower panel). All models have log Q = −12.45 (series “E”). The iso-contours correspond to a nitrogen emission line ratio of unity.
This figure is made of several images, please see below:
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