We reconsider the rotational analysis of the absorption electronic A-X and D-X band systems of OH and show that interstellar observations of OH in front of bright stars have been interpreted with oscillator strengths that are too small by a factor of 2. However, the column densities reported from the various observations are approximately right, as a result of the neglect, in their interpretation, of the two different initial levels, which compensates the previous error.
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E. Roueff (1996) studied this question.