Fig. 1
Continuum-subtracted PACS spectra at 63 μm. The horizontal, black dashed line marks the position of the 3σ detection limit for each observed spectrum. The blue solid line shows a Gaussian fit to the observed data. The vertical, blue dashed lines mark the position of the line transitions of [OI] at 63.18 μm and o-H2O at 63.32 μm. We show the spectrum of DK Cha in Fig. 4.
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