Size-linewidth relation for M 33 clouds and other galaxies observed with similar or better angular resolution. In the top panel, the clouds with extrapolated radii are shown as magenta symbols and the remaining 80% of the M 33 clouds are shown in red. The non-M 33 clouds are shown as black symbols. The region populated by LMC clouds is hatched and the M 51 data (squares) are binned averages. The lower panel has logarithmic axes and has all M 33 clouds in red. The line labeled SRBY is the Solomon et al. (1987) relation for the Galaxy.