Fig. 3.
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Performance of estimator S34 based on sulphur emission lines for models with S/O that is not fixed. Panel a shows models for a fixed value of the ionisation parameter log(U) = − 1.5, panel b shows models for log(U) = − 2.0, panel c models with log(U) = − 3.0, and panel d those with log(U) = − 3.5. Models are shown following the same notation as in Fig. 1.
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