Plots of the optically derived mass-accretion rates versus the X-ray derived mass-accretion rates. Each panel shows the optical accretion rate derived from a different tracer, indicated in the lower right corner of the plot. The CTTSs are colour coded (see lower left corner of each panel). We plot only those cases for which we have measured the mass-accretion rate for all the stars in our sample (see Table 5). The bottom right panel shows a plot of the optical mean mass-accretion rate plotted against the X-ray accretion rate. There is a very small range, a factor  ≈2, in X-ray accretion rate calculated for the entire sample, whereas the optical mass-accretion rates span a range of  ~3 orders of magnitude.