The 1₁₀-1₁₁ transition of deuterated water has been mapped toward the Kleinmann-Low nebula in Orion with the Hat Creek millimeter interferometer. The synthesized beamwidth is 3arcsec.4. The "hot core", "plateau", and "compact ridge" emission regions can be identified on the maps. The compact ridge appears to consist of streamers of gas which connect to the hot core clump and are directed away from the source IRc 2. The HDO/H₂ abundance toward both hot core and compact ridge is inferred to be ≡10⁻⁷, unexpectedly high for such warm regions.
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Plambeck et al. (1987) studied this question.