Figure 1.
Observed ERE for (a) the Red Rectange (from Witt & Boroson 1990); (b) the planetary nebula NGC 7027 (from Furton & Witt 1992); (c) the NGC 2327 reflection nebula (from Gordon, Witt & Friedmann 1998) and (d) the north-western filament of the reflection nebula NGC 7023 (Witt, personal communication, see also Witt et al. 2006). Panels (a)–(c) reproduced by permission of the AAS.

Observed ERE for (a) the Red Rectange (from Witt & Boroson 1990); (b) the planetary nebula NGC 7027 (from Furton & Witt 1992); (c) the NGC 2327 reflection nebula (from Gordon, Witt & Friedmann 1998) and (d) the north-western filament of the reflection nebula NGC 7023 (Witt, personal communication, see also Witt et al. 2006). Panels (a)–(c) reproduced by permission of the AAS.

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