CO line flux as a function of infrared excess. Circles indicate CO detection, and triangles indicate upper limits. Large symbols are from our survey, and small symbols for literature data (Dent et al. 2005; Kastner et al. 2010; Moór et al. 2011, 2015; Hales et al. 2014; Lieman-Sifry et al. 2016). Orange symbols stand for the CO J = 2 → 1 measurements and green symbols for CO J = 3 → 2 measurements. The tentative detection around HD 23642 is plotted with an empty circle.
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