Fig. 5
Spectral maps of the SO 22 → 11 line as observed with the IRAM 30-m telescope. The central velocity is indicated in the top-left corner. Contours are 0.5 K to 4.5 K by steps of 0.25 K. The crosses indicate the positions of the protostellar cores B1b-N and B1b-S. The star denotes the position of B1b-W. In the last panel we plot the beam at 86.094 GHz.
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