Mass accretion rate estimated from various accretion tracers. The solid line gives the mean value of log (Ṁ_acc) and the dashed line is the ±1σ uncertainty. The errors on the individual measurements mainly come from the error in the line fluxes and in the value of the on-source extinction. The value of Ṁ_acc calculated by Muzerolle et al. (2005) from modelling of the Hα line and from the UVES spectra presented by Whelan et al. (2009b) are included here for comparison. No error estimates were given in Muzerolle et al. (2005).