sample.

We emphasize that a limitation of this analysis is that the data were obtained with single fibers centered on resolved galaxies, and therefore not all of the light is included in the 3 diameter fiber aperture. For reference, 3 corresponds to 2.2 kpc at the median redshift ($z = 0.078$) of our sample. The missing fraction due to this aperture bias will depend on redshift for galaxies of similar sizes, and will depend on mass and star formation rate due to the flux-limited nature of the sample. This aperture bias is important because galaxies exhibit radial abundance gradients [e.g. @Searle71; @Kennicutt03; @Bresolin09a; @Bresolin09b; @Berg13; @Sanchez14] that will cause abundances measured in the central region of a galaxy to overestimate the total abundance. @Tremonti04 investigated this aperture bias for SDSS observations and found metallicity variations of 0.05 to 0.11 dex with redshift for galaxies of similar absolute $z-$band magnitudes. @Kewley05 studied aperture effects with the Nearby Field Galaxy Survey and recommended that fiber spectroscopy include at least $>20$% of the galaxy light (typically $z > 0.04$ for SDSS observations) to minimize systematic and random errors, and this corresponds to most of our sample. Based on these studies, we estimate that 