The relative positions of the 86 GHz SiO maser features toward Orion-IRc2 were measured with an accuracy of + or - 0.015 arcsec using the Hat Creek millimeter array. Maser emission appears to originate from an 0.15 arcsec diameter ring. A simple model of maser emission from an expanding, rotating disk is able to reproduce the observed velocity structure of the ring.
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Plambeck et al. (1990) studied this question.