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Fig. 7
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Dependence of the [S II] 6716/6730 Å line ratio on the electron number density, ne. Different curves are the model predictions at different temperatures computed using PyNeb (Luridiana et al. 2015). The two dotted lines mark the approximate upper and lower physical limits on the [S II] 6716/6730 Å line ratio at Te ~ 104 K.
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