Interacting planetary nebulae - I. Classification and orientation

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Table 3

Consistency of the three IPNe classifications.

Wareing et al. (2007)	Features	Rauch et al. (2000)	TK96

WZO1	Halo interaction	young	H
WZO2	Spherical PN with enhanced brightness in the interaction region.	mid-age	B, S or F
WZO3	Displacement of the CS; One-sided PNe and instabilities.	old	C
WZO4	The CS stripped outside the PN.	old	–

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