Fig. A.1.
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Percentages of HeII in relation to Hβ. The X-axis shows the analytical predictions based on the input spectra, where the factor 1.74 corresponds to typical nebular conditions. The dashed line shows a one-to-one relation between the predictions and the outputs. The upper and lower boundary for each model correspond to log U = −1.5 and log U = −3.5, respectively.
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