Correlations of the PDR covering factor with metallicity (top left panel), specific star-formation rate (top right panel), LTIR/LFUV ratio (bottom left panel), and [O III]88/[C II] ratio (bottom right panel). Galaxies are color coded by Z. Spearman’s rank correlation coefficient and significance of its deviation from zero in parenthesis are indicated in the top-right corner. Lower-Z galaxies tend to have smaller covering factors but we do not find strong trends with observed line ratios. The apparent floor of 0.2 in the PDR covering factor is due to the chosen steps for this parameter in the grid.
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