A comparison between molecular gas mass and dynamical mass of our H-ATLAS lensed sample. The grey dashed lines indicate the ratio of M_gas /M_dyn,vir. Colours are coded according to the average CO linewidth. The size of the symbol represents the value of r_half of each source. There is a clear trend that sources with smaller linewidths have large ratios of M_gas /M_dyn,vir. The source index can be found in Fig. 1 and Table B.1.