Metallicity differences Δlog(O/H) between SDSS and VIPERS samples. Contours show the 1σ, 2σ, and 3σ levels of the MS distributions for the VIPERS sample. The vertical black solid line indicates the mass below which the MZR at intermediate redshift flattens. The vertical black dashed line shows the most constrictive mass limit for completeness (log M_⋆[M_⊙] = 10.47 for 0.65 < z < = 0.8) in the redshift range observed by VIPERS (Davidzon et al. 2016). In the left panel, the M_⋆-SFR bins are color-coded according to the metallicity difference in dex. In the right panel, the bins are color-coded according to the metallicity difference normalized by the 〈σ_med〉_VIPERS.