Measurements of 11.3 μm PAH fluxes of the mock spectra using different galaxy template libraries. Left panel: the result of DH02 mock spectra vs. that of R09 mock spectra. Right panel: the result of DH14 mock spectra vs. that of R09 mock spectra. The dashed lines indicate the one-to-one relations. The DH02 and DH14 results are systematically larger than the R09 result. Compared with the R09 result, for the fixed PAH flux measured from real data, the DH02 and DH14 libraries underestimate the galaxy FIR fluxes (see Section 4.3).