Diagram showing the best-fitting hydrogen slope dX∕dQ for SMC AB11. The temperature T* is plotted as a function of dX∕dQ for models with surface hydrogen mass fractions Xs which correspond to Xs, obs ± 1σ. Each “star” symbol represents a stellar model. The blue dashed line represents observed T* of SMC AB 11 to which the models are compared, whereas the blue shaded area represents the error margin. We note that the x-axis is in log scale.
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