Lupus ¹²CO and ¹³CO (J = 2−1) line luminosity are presented with black squares (empty squares if the ¹²CO line is partially absorbed by the cloud), where the ¹³CO nondetections are shown as upper limits by the black arrows and the ¹²CO (and ¹³CO) nondetections are shown as upper limits by the gray arrows. DALI model results for T Tauri disk models are shown in panel a, and those for VLMS disk models in panel b with filled circles, color-coded by disk mass. Different symbol sizes represent different values of the critical radius R_c. The scales are different from those in Fig. 1.