Top: [O i] 63 μm line flux versus amount of IR excess. We find no correlation between these variables. The two objects to the left are HD 141569A and 51 Oph, a transitional and a compact disc, respectively. Bottom: [O i] 63 μm line flux versus the slope b of the SED at far-IR to mm wavelengths. The line flux also does not correlate with the SED slope. Diamonds are group I sources, asterisks are group II sources.