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Published online by Cambridge University Press: 04 August 2017
The entire sky has now been surveyed in the 21-cm line with an angular resolution of about 0.5 degree. In the north, above declination −20° or so, the “galactic plane” |b|<10° has been completely sampled Weaver and Williams (1973; 1974). Above declination −30° or so, the sky outside the galactic plane has been almost completely sampled (Heiles and Habing, 1974; Heiles, 1975).