6300 Å [O i] emission (black histograms), and CO v = 1−0J ≤ 15 average line profiles (red lines), together with their 10% width [O i]/CO ratio. The CO emission of HD 141569 is averaged over the v = 2−1 lines, and because of problems with the telluric correction, we have used the high (Ju ≥ 30) for R CrA and HD 150193. The CO line profile plotted for HD 101412 is a blend of the 13CO v = 1−0 R(23) and the 12CO v = 4−3 R(35) lines. We show [O i] data of HD 97048 and HD 100546 from Acke & van den Ancker (2006), of HD 101412, HD 135344B, and HD 179218 from van der Plas et al. (2008), of HD 190073 from van Lieshout and Bagnoli (priv. comm.; HERMES spectrograph at the Mercator telescope), and from Acke et al. (2005) for the other stars. We note that both the CO and [O i] lines have been centered at 0 velocity, and the differing velocity scale for HD 141569.
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