(Top) Mass–radius relation of 19 Hi-GAL clumps. The shaded area represents range of masses consistent with low mass star formation, satisfying the criteria M ≤ 870 M_⊙ (r/pc)^1.33 (Kauffmann & Pillai 2010). The dotted lines indicate surface density thresholds of 1.0 g cm⁻², and 0.05 g cm⁻², respectively. (Bottom) Bolometric luminosity-mass relation of 19 Hi-GAL clumps. Dotted lines represent (L/M) = 0.1, 1.0, and 10.0 L_⊙/M_⊙, respectively.