a) Integrated line area as a function of the FWZPfor the distance- and mass-limited subsample. The size of the open circles show the signal-to-noise of the line area. Blue circles show the clumps associated with H II regions, red are associated with (M)YSOs, and green corresponds to the infrared-quiet clumps. b) Line luminosity. The dashed line shows the L_SiO(2−1) = α_L × FWZP_SiO(2−1)−β_L relation, where Nguyen-Luong et al. (2013) determine α_L = 144, β_L = 751 for the sample of objects in the W43 Main complex. The SiO (2–1) line luminosity of the CygX-N40 MDC from Duarte-Cabral et al. (2014) is shown in dotted line.