Scatter correlation plots. The filled circles show stars with discs observed at long wavelengths, the star markers stand for the stars without a disc detected at long wavelengths (however, we stress that a disc could still be present at detection levels lower than what was used by Harris et al. 2012 or Cabrit et al. 2006) and the diamonds are the stars where we have no high spatial resolution long-wavelength observation of the systems. The blue markers are primary, the green markers are secondary or tertiary stars.