Fraction of PAH as a function of the gas metallicity of the dense/fragmented gas phase. The solid blue and green lines indicate the modified relations based on the flatter and steeper relations, respectively. The black solid line shows the original relation used in G.A.S. (black solid line in Fig. 1). The blue and green shaded areas show the full G.A.S. distribution generated by G.A.S. around the two modified relations. Data points are similar to those used in Fig. 1.
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