Correlation between ∫TdV (200 pc), the integrated intensity in the 557 GHz line scaled to a distance of 200 pc, and Lbol, the apparent bolometric luminosity of the source. Data points from Kristensen et al. (2012) are marked according to their Tbol classification (filled = Class 0, open = Class 1). The borderline Class 0/Class 1 sources according to our model fits (see text) are indicated by a vertical cross. Colored rectangles illustrate the predicted loci of the four models in Table 1 for = 3.2–25 AU, i = 30°−−80°, and true Lbol ranging from 0.5Lacc to Lacc+2 L⊙ (see text): red = X0, pink = S0, green = X1, blue = S1.
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