In ten 5-10 Myr old Upper Sco disks, dust masses are about an order of magnitude below Lupus values, yet the C18O-N2H+ flux correlation matches Lupus, indicating stable CO abundance over the Class II stage.
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The ALMA Survey of Gas Evolution of PROtoplanetary Disks (AGE-PRO): IV. Dust and Gas Disk Properties in the Upper Scorpius Star-forming Region
In ten 5-10 Myr old Upper Sco disks, dust masses are about an order of magnitude below Lupus values, yet the C18O-N2H+ flux correlation matches Lupus, indicating stable CO abundance over the Class II stage.