(a) Mass and radius relationships for all identified ¹³CO clumps. The red and blue dots correspond to clumps that respectively contain and do not contain class I YSOs. The distribution of YSOs is illustrated in Fig. 11. The black, red, and blue dashed lines represent the best power-law fits for the mass-radius relationship for all clumps, YSOs clumps, and no YSOs clumps, respectively. The yellow area denotes the empirically derived parameter set m(r) < 870 M_⊙(r/pc)^1.33, where massive star formation should not occur (Kauffmann & Pillai 2010). (b) Virial mass relationships for all ¹³CO clumps, The black dashed lines correspond to positions with virial values of 1 and 2. Values below unity represent the gravitationally bound state and values above two indicate a gravitationally unbound state, respectively (see also Eq. (17)).