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Fig. 5


Observations taken from the HIFISTARS sample showing the 312−303 transition of ortho-H2O (see Fig. 1). The HO line is clearly detected in W Hya and IK Tau (Justtanont et al. 2012) which have much lower mass-loss rates than in AFGL 5379 and OH 26.5+0.6 (Justtanont et al. 2013).

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