A 140 deg strip along the Galactic plane with the VLA has been surveyed for OH masers. Fifty OH masers, including 14 new sources, were detected. The masers have a very narrow distribution in Galactic latitude and are probably Population I objects. A study of the IRAS counterparts to OH masers from this and other surveys reveals a strong correlation between the infrared colors of OH masers and Galactic latitude.
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Becker et al. (1992) studied this question.
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