Differential mass functions, dN/dM ∝ M^α, for clumps from Gaussclumps (upper panels) and clumps from Clumpfind (lower panels). The dashed blue lines represent fits to single power laws and the dot-dashed pink lines represent the fits to log-normal distributions. The parameters α, σ, and μ are given in each panel. The vertical dotted lines indicate the 6σ_rms (15 M_⊙) mass given by the noisiest map.