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Fig. 9
The spatial distribution of deuterated species in IRAS 4 region. Integrated intensity map (core; from +5 to +9 km s-1) of C2H which traces the envelope in colors, overplotted with H2D+ in green contours and D2CO in yellow contours. The contour levels are set to 0.014, 0.016, 0.023 and 0.03 K (rms ~ 0.005 K).
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