Distribution of f_turb, for the protostellar clump populations identified with clfind (left-hand panels) or gaussclumps (right-hand panels), measured from the HARP C¹⁸O J = 3 → 2 data. Overlaid for comparison are the distributions found by KJT07 for 157 candidate cores using C¹⁸O J = 2 → 1 (upper panels, pink) and N₂H⁺J = 1 → 0 (upper panels, blue). A prediction for cores from the gravoturbulent simulation of Klessen et al. (2005) is also shown for turbulence driven on large scales (lower panels, brown). For that simulation the turbulent fraction extends beyond 3.5 to 4.3 (not plotted), though there are small numbers of clumps in those bins (∼2 per cent).