Mass distribution of identified clumps in G345.5+1.0 with masses higher than 100 M_⊙, plotted as dN/dlog (M/M_⊙) versus mass, where dN/dlog (M/M_⊙) is approximated by the number of clumps ΔN within a logarithmic mass interval Δlog (M/M_⊙). Here, Δlog (M/M_⊙) is constant,  ~0.37. Error bars are estimated by . The continuous line represents the mass distribution fit with dN/dlog (M/M_⊙) ∝ M^1 − α, where the spectral mass index α is 1.6 ± 0.1 for masses between  ~100 and 1.3 × 10³ M_⊙.