Histogram of angular momenta for M 51 clouds. In black for the subsample S/N ≥ 7 and in red for the subsample S/N ≥ 10. Note that the gradients in the higher S/N subsample are better defined (more prograde and with a more significant gradient). We have included a correction for beam-smearing as in B18. The angular momenta of the M 51 clouds are substantially higher than in M 33 (see middle panel of next figure).