Non-recombination contribution of Balmer hydrogen line intensities as a function of the oxygen abundance. The red dashed, blue solid, and green dotted lines show fits for starburst ages of 2.0, 3.5, and 4.0 Myr, respectively. The dependences for starburst age of 1.0 Myr are identical to those for 2.0 Myr. Symbols are CLOUDY-modelled data.
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