Fig. 13.
NIR and MIR flux ratios of N3 (3.2 μm)/N2 (2.4 μm), S7 (7.0 μm)/N3 (3.2 μm), S11 (11.0 μm)/S7 (7.0 μm), and L15 (15.0 μm)/S9W (9.0 μm) of the PAH galaxies as a function of redshift. Error bars are for one sigma. The flux ratios of the redshifted SWIRE SED templates of Sc (blue), M 82 (green), and NGC 6090 (red) are overlaid with connected crosses. To enable easier visual comparison among the panels, the Y axis covers the same 1.8 dex-wide range in the flux ratios, excluding the panel of N3/N2 (covering half the range).
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