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Fig. B.4.
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[OIII]52 μm/Paα line ratio as a function of the gas metallicity Zgas for three gas densities nH = 10 (circle), 100 (square), and 1000 (triangle) cm−3, and for different values of the ionization parameter, logU betwen -4.0 and -1.0 (with increasing size of the symbols), for fcov = 0 (HII region only).
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