Deviation of the FMR as a function of the μ0.32 parameter. Black and red circles show metallicity differences of the averaged and stacked spectra, respectively, within each μ0.32 bin compared with the FMR. The black error bars show the dispersion of the average metallicity within each bin. The red error bars show the error of the metallicity of the stacked spectrum in each bin. Blue diamonds, blue squares, green triangles, and green asterisks show the average metallicity differences compared with the FMR of galaxies at z ~ 0.25, 0.65, 1, and 2, respectively (Cresci et al. 2012; Vergani et al. 2012; Law et al. 2009; Lehnert et al. 2009).
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