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(a) The resonance wavelengths of the spectrometer rings are uniformly distributed and in the correct sequence (green, red, cyan, magenta, yellow, gray). (b) Spectra from some devices exhibited nonuniform spacing and incorrect sequence. (c) Dice with nonuniform spacing and incorrect sequence are marked with a red “X”. Dice without these flaws are marked with a green check. Of 36 dice sampled, 17 contained spacing and sequencing errors.
