Disk-integrated CN N = 3−2,  J = 7∕2−5∕2 fluxes in the complete Lupus disk survey (this work) compared to those of a sample of disks in Taurus–Auriga (Guilloteau et al. 2013) and ρ Oph (Reboussin et al. 2015). Source distances for all objects were taken from Gaia DR2, if available; otherwise, median distances to the three populations were used (Gaia Collaboration 2018; Bailer-Jones et al. 2018). Fluxes were then scaled to the median distance of Lupus (160 pc). Colored arrows indicate the effect of using different CN (N = 2−1,  J = 5∕2−3∕2) ∕ (N = 3−2,  J = 7∕2−5∕2) scaling parameters over the full range of model values.