Outflow forces over bolometric luminosities for a sample of low-mass protostars, a sample of high-mass protostars and extragalactic sources. In each plot, the sample, from which the plotted best-fit of the F_CO - L_bol was taken, is highlighted. (1) Best-fit to all extragalactic sources. (2) Best-fit to AGN extragalactic sources. (3) Best-fit to starburst extragalactic sources. (4) Best-fit to high-mass protostellar sources. (5) Best-fit to all low-mass protostellar sources. (6) Best-fit to Class I low-mass protostellar sources. (7) Best-fit to Class 0 low-mass protostellar sources.