Fig. 8
Final spectra in the three cases reported as probable detections of CO and 13CO gas in WFs. These spectra are the result of subtracting synthesized off-source from on-source spectra for each source and transition. The superimposed red lines are fits as circumstellar shells (for IRAS 18460+0151 and IRAS 18596+0315) or Gaussian profiles (for IRAS 18286-0959). Each isotope and transition has been fitted independently (see text).
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