Comparison of the modeling of the HDO 11,1–00,0 and 10,1–00,0 fundamental transitions observed towards IRAS 4A with an added absorbing layer (in green) and without this layer (in red). The HDO column density in the absorbing layer is about 1.4 × 1013 cm-3. The broad outflow component seen in the observations was subtracted. The continuum refers to SSB data.
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