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and inexpensive system [3]. It appeared however, that there were many problems in a CCD's properties i.e. dark current, read-out noise, flat fielding, and so on. By taking flat field frames inside a integrating sphere, we have succeeded to find the dust bands from the ground [4]. It is known that there still remains a problem of how to reduce the noise originating from the CCD itself. In this paper, we will report the development of new system with much smaller instrumental noise.

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