The Fundamental Metallicity Relation (FMR). The parameter μ_0.32 = log (M_∗) − 0.32 log (SFR) is the projection in the stellar mass, SFR plane. The two circles (red) are the two high-redshift SN Ia host galaxies with measured gas-phase metallicity, hSDF0705.25 and SN Primo (Frederiksen et al. 2012). The crosses are the binned data from the Sloan Digital Sky Survey (York et al. 2000, SDSS) used in Mannucci et al. (2010). The diamonds (blue) are GRB host galaxies used to calibrate the low metallicity slope in Mannucci et al. (2011, z < 1. The squares are lensed galaxies from Christensen et al. (2012, yellow, z > 1 and Richard et al. (2011, green, z > 1.5. The dark (blue) line is the parameterization of Mannucci et al. (2011) (solid in the range of validity, extrapolation in dashed blue, high metallicity as constant, low metallicity as straight line). The two SN Ia host galaxies (z = 1.5) are fully consistent with the FMR of star-forming field galaxies.