Fig. 8
Average spectra of 12CO (top), HCN (middle – indicating the hyperfine structure lines of HCN J = 1 → 0 ) and HCO+ (bottom), obtained from the 200′′-beam area (dashed circle in Fig. 7) toward M17SW, centered at offset position (−100′′, 0′′). This correspond to a region of ~1.92 pc in diameter at the distance of 1.98 kpc (Xu et al. 2011).
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