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the capability of taking short exposures (from milli-seconds to
seconds) with essentially no dead-time between exposures
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multi-channels (3 or more) covering a wide wavelength range
(u' to z') in order to distinguish a blackbody spectrum from a stellar
spectrum
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simultaneous measurement of the different wavelength bands to
avoid problems of stochastic variations
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imaging capability in order to simultaneously measure target,
comparison stars and sky background and to avoid the need for fixed
apertures
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high efficiency and the capability of being mounted on
large-aperture telescopes
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