ALMA 890 μm fluxes, scaled to a common distance vs. observed size (R_68%, see text), for stars (blue) and BDs (red) in the Lupus star forming region. Upper limits of disk sizes that could not be determined accurately from our disk modeling methodology are shown as triangles, they represent the 95% confidence level of the disk size. R_68% error bars account for 1σ from the mean value, flux error bars are associated to the 10% flux calibration uncertainty.