Results of synthetic carbon training for various S/N implementations. Left panel: [C/Fe] estimates from the network trained on S∕N = 122 inputs; the color of the estimates are proportional to the S/N of the validation photometry, where red indicates lower S/N. Middle panel: [C/Fe] residuals for networks of various S/N are shown, as a function of the S/N for the validation sets employed. Right panel: median residuals for three tiers of validation sets, S∕N < 28, S∕N < 36, and S∕N < 65, are shown, as a function of the network S/N.