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Published online by Cambridge University Press: 03 August 2017
We limit the spectral index of density fluctuations in the interstellar plasma by comparing maser sizes, due to small-scale fluctuations, with wander of masers from constant velocity, possibly due to refraction by large-scale fluctuations. The wander of the masers about constantvelocity motion limits power-law spectra of the fluctuations to indices less than 4.0.