EWs of C III] as a function of gas-phase metallicity. The blue, orange, green, red, purple, and brown curves denote the metallicity dependencies for exponential SFH (see Appendix B) with stellar ages of 1, 2, 5, 10, 25, and 50 Myr, respectively. The gray line and shaded region represent the C III] EW measurement of JADES-GS-z14-0. The observed C III] EW is typical of galaxies with Z>0.3 Z_⊙ or Z<0.05 Z_⊙