Fraction of PAH as a function of the gas metallicity in the dense/fragmented gas phase. The blue shaded area shows the full G.A.S. distribution. Blue circles and light-green squares show Ciesla et al. (2014) and Draine et al. (2007) data points respectively. Green triangles show Rémy-Ruyer et al. (2015) sample shifted by 0.2 dex. The black solid line corresponds to our mean relation (Eq. (3)). The original mean relation of Rémy-Ruyer et al. (2015; their Eq. (5)) is shown with the solid gray line. Dashed black lines mark the 3σ limits around our mean relation.
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