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Abstract
The precision and reliability of sky subtraction is the limiting factor in faint-object spectroscopy. It has been believed that precise sky subtraction cannot be achived with multi-object fibre spectrograph systems, so that slit observations are most suitable for study of the faintest objects, in spite of their very large loss in multiplex advantage over multifibre systems. In general, the sky signal recorded together with that of an object of interest has both astronomical and instrumental contributions. These two backgrounds have fundamentally different properties that necessitate a clear distinction in their handling to achieve precise and reliable sky subtraction
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