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Fig. 1


Distribution in longitude and latitude of the OH-maser stars in the surveys of Sevenster et al. The observations were limited to | b | ≤ 3deg. In red are shown the maser stars with a radial velocity | vrad | ≥ 220 km s-1 taken from Sevenster et al. (1997a,b, 2001) and from other surveys; see Table 1.

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