Fig. 2
MSX two-color diagram with the position of the confirmed and possible OHPNe and related objects for which MSX data are available. The vertical and horizontal lines divide the diagram into four quadrants that correspond to the areas of higher probability of containing the different types of objects labeled on the diagram (Sevenster 2002). The symbols have the same meaning as in Fig. 1. The triangle represents the “water fountain” post-AGB star IRAS 15445 − 5449.
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