Correlations plots. The left panel shows the correlation between the oxygen fine structure lines. In the right panel F_63  μm is the continuum flux at 63 μm: open yellow circles indicate objects with [O i] 145 μm detections; open orange circles indicate objects with [O i] 145 μm data not available. Detections are plotted as filled circle and upper limits as arrows, red for HAeBe group I, blue for HAeBe group II, green for TTs. All luminosities are expressed in L_⊙ and are plotted on a logarithmic scale.