Comparisons between the spectroscopic and photometric PAH 7.7 μm luminosities of the PAH galaxies. The photometric monochromatic luminosity at 7.7 μm, νL_{ν photo} (7.7 μm), is compared with the spectroscopic PAH 7.7 μm luminosity, L_PAH (7.7 μm) (top), and with the spectroscopic monochromatic luminosity at 7.7 μm, νL_{ν spec} (7.7 μm) (bottom). Their luminosity ratios are plotted as a function of redshift in the right panels. Error bars are for one sigma. In all panels, black broken lines represent the best-fit linear functions with fixed unity slopes, and red dot-broken lines indicate the one-sigma scatters.