Deep survey of millimeter radio recombination lines toward the planetary nebulae IC 418 and NGC 7027

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Fig. 2

Left panel: Schematic defining the different ellipsoidal shells to model a PN with Co³RaL. The light red area (up to R₂) shows the filled shells of the PN. Center and right panels: 3D models of IC 418 and NGC 7027 (see text on Section 3.2 for further details).

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