Fig. 1
IRAS colour–colour diagram showing the location of all the objects of our sample (filled circles), except for LSE 148, which has no measurements of IRAS fluxes. Solid lines shows the post-AGB/PNe locus defined by Pottasch et al. (1988). Open circles represent the sample of Galactic PNe of Perinotto et al. (2004) for comparison.
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