Total flux at 250 μm for 21 of our GDCs plotted against the integrated CO(J = 2-1) intensity of the associated APEX pointings from F14. The coloursindicate whether F14 detected CO (blue circles and yellow squares) or not (red crosses: upper limits in I_CO). The blue dashed line shows a fit only through the blue data points (orthogonal distance regression also taking the error bars into account); the slope of this fit is 0.8 ± 0.2.