Fig. 4
SEDs of the possible OHPNe. Symbols mean the same as in Fig. 3. J, H, and K measurements of IRAS 17168-3736 were taken by Ramos-Larios et al. (2012). The flux densities of radio continuum in the different sources were measured by the following authors: IRAS 17150 − 3754 (Pottasch et al. 1987), IRAS 17221 − 3038 (Pottasch et al. 1988; Condon & Kaplan 1998, this paper), and IRAS 17168−3736 (this paper).
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