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Dense gas is defined as gas whose volume density is higher than a threshold $\\rho_{th}=700\\,M_{\\odot}.pc^{-3}$, i.e. HCN(1-0)-mapped gas. We divide the clump into two regions: a dense inner region (where $\\rho_{clump}(r) \\geq \\rho_{th}$), and low-density outskirts (where $\\rho_{clump}(r) < \\rho_{th}$). 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