Fig. 2
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Illustration of the light path (blue) through the two-arm FIOS prototype and accompanying external spectrograph (not to scale). Top left: telescope feeds the system via a fiber (orange). Top: FPI two-arm setup holds two etalons-dualons and creates the ultra-high-resolution spectral profile that is fed to an external spectrograph. Bottom: lightMachinery external spectrograph.
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