A low-energy X-ray survey (E > 150 eV) of the Cygnus region and the galactic plane from Cygnus to Norma is described. The soft X-ray emission from the Cygnus Loop was resolved into two distinct regions which contain several of the major optical filaments. Upper limits for soft X-ray emission from the supernova remnants HB 21, CTB 72, CTB 63, and W63 are given.
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Borken et al. (1972) studied this question.
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