Outflow momentum flux, F_CO, as a functionof powering source bolometric luminosity L_bol. Data for outflows A, B, and C in SDC335 are indicated by the filled squares and associated errorbars. The origin of the errorbars are discussed in the main text. The filled and empty hexagons are the Class 0 and Class I low-mass protostars from Bontemps et al. (1996). The diamonds are low-mass Class I sources from observation of Ophiuchus (van der Marel et al. 2013). Filled and empty triangles are literature values for Class 0 and I objects used by van der Marel et al. (2013, see their Table E.1). The stars denote the Duarte-Cabral et al. (2013) high-mass Class 0 analogues and the triangles are outflows from high-mass protostellar objects observed from the RMS survey (Maud et al. 2015). The green dashed tracks with arrow heads are the evolutionary tracks for decreasing or intermittentaccretion from Duarte-Cabral et al. (2013). The arrow heads represent the point at which a protostar of a given mass (given at the end of the arrow) has accreted 50 and 90% of their envelope mass. Red dotted line is the best fit to the plotted Class 0 sources extended to high luminosity with the red shaded region given the 1-σ error margin for this fit. The blue dashed-dot line and shaded region are the same but for the best fit to the plotted Class I sources.