Fig. 15
Distribution of SHβ surface brightness for Spitzer dust subtypes and different ionization classes. From top to bottom: distributions for dust subtypes of DC, OC, and CC PNe respectively. From left ro right: distributions for low ionization (O++/(O++O++) < 0.3); intermediate ionization (O++/(O++O++) > 0.3, and He++/(He++He++) < 0.03), and high ionization (He++/(He++He++) > 0.03) are presented.
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