Comparison of the HDO 11,1–00,0 transition (black) observed towards IRAS 4A and the SiO ν= 0 J = 2–1 line observed towards IRAS 4A (green), a position in the red part of the outflow (red, position (+ 0″, + 20″) with respect to IRAS4A) and two positions in the blue part of the outflow (blue, upper spectra: position (− 12″, − 16″), lower spectra: position (− 12″, − 4″)). The narrow emission line of SiO appears at the same velocity as the thin absorbing layer of HDO.
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