Fig. 2
Integrated continuum maps, CH2DOH, CH3 OD, and CHD2OH emissionobserved towards IRAS 4A for the three PdBI frequency settings (top: 145 GHz, middle: 165 GHz, and bottom: 225 GHz). Red contours show the 3σ and 6σ levels, whilstblue contours are in steps of 9σ. The synthesised beams are shown in the bottom left corner of each panel. The black crosses depict the position of the protostars.
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