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Abstract The Faint Object Camera and Spectrograph (FOCAS) is a Cassegrain optical instrument for the Subaru Telescope. Its capabilities include 6^ FOV direct imaging, low-resolution spectroscopy (R=250 -- 2000 with 0 {. ^ { }4} slitwidth), multi-slit spectroscopy and polarimetry. We describe the overall design of FOCAS, its observing functions, and the performance verification procedures that have been carried out.
Kashikawa et al. (Wed,) studied this question.
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