Fig. 1
IRAS two-color diagram with the position of the confirmed and possible OHPNe, as well as of related objects, with which IRAS data could be associated. Asterisks represent the confirmed OHPNe, circles are the candidate OHPNe, and squares are symbiotic stars. The solid line is the curve modeled by Bedijn (1987) showing the location of AGB stars.
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