Open Access

Fig. 2


13CO 1–0 line spectra resulting from the sum of all spectra observed in the 1.8° × 0.8° area covering W43 (black line), compared to those summed in the circular areas shown in Fig. 4 to be associated with W43-main (red dashed line) and W43-south (blue dashed-dotted line). The main and complete velocity ranges of W43 (see text) are indicated with light- and dark-gray filling.

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