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Fig. 1


POSSII red images for seven of the nine PNe observed in our study, with HST NICMOS images for BD+30 and NGC 7027. Circles illustrate beam diameter (half-power beam width) of the telescope and the position observed, where 12 CO (1–0) and 12CO (2–1) were chosen to represent the range in beam size across frequency (red circle and blue circle, respectively). North is up, east is to the left in each frame.

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