PACS line fluxes, ratios, and line-to-LTIR ratios as a function of metallicity. The DGS galaxies are represented by filled circles (compact sample) and stars (extended sample), color-coded by metallicity. Spearman correlation coefficients applied to the DGS compact sample are indicated in the top left corner (when found above the chosen significance level and with more than 8 data points). The large red rectangles show the range of values covered by the Brauher et al. (2008) sample, at metallicity around solar.
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