Rest-frame C III] EW vs. gas-phase metallicity. Black points represent the z ~ 0 and z ~ 2 literature compilation of Rigby et al. (2015) with triangles denoting lower limits on EW, and pink points represent the MUSE galaxies. Based on this data, Rigby et al. (2015) claim that metallicity sets an envelope to the C III] equivalent width, i.e., low metallicity is a necessary but not sufficient condition for high C III] equivalent width. Regardless of whether we adopt the upper or lower R23 branch metallicities, we cannot rule out such a claim with the MUSE objects.
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