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abstract
I report detection and observations of scattered halos around astrophysical H$_2$O masers. I argue that Rayleigh scattering in the HII region that encloses the masers is responsible for these halos. Just as fog reveals the shape of a searchlight beam, this scattering reveals the pattern of radiation from the highly-beamed masers. Analysis of the properties of the halos indicates that the beam of radiation from the maser has an opening angle of $0.002<\theta<0.02$ radians.
