Comparison of L(8) and L(TIR)). Above log( L(TIR)) = 11, the relation appears almost to saturate due to a number of very luminous galaxies with suppressed emission at 8 μm. The diamonds are from Dale et al. (2007) and (for the LIRGs and ULIRGs) from our reduction of archival data. The circles are from Engelbracht et al. (2008); filled ones are within 0.25 dex of solar metallicity (in O/H) while open ones indicate metallicity between 0.25 and 0.5 dex below solar.