Fig. 6
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Location of models from the 3MdB database (see text for details) in an [O III]4363/5007 vs. [N II]]5755/6584 diagram. The top panel shows models of the PNe, and the bottom panel shows shock and shock+precursor models. The colour code for the models corresponds to the Hα/Hβ line intensity ratio. The red star shows the location of the 2021 observations of IRAS 22568.
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