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.