Mass-radius diagram of SABOCA compact sources. The quiescent cores and star-forming cores are indicated with blue and red in 2−4 kpc (hollow markers) and 1−2 kpc (filled markers) distance bins. The dashed lines show the constant volume density of 104, 105, and 106 cm−3. The magenta dotted line indicates Larson’s third relation of approximately 1021 cm−2 column density. The gray filled region is below the empirical threshold of massive star formation from Kauffmann & Pillai (2010), which is scaled to match the dust opacity values we used in this work. Red and blue lines indicate the fitted linear regression for the quiescent and star-forming cores at 2−4 kpc.
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