Figure 5.

Error (calculated by Eq 12) for the six models as a function of the number of data points (echos) used in the curve-fitting. Echos were added by including a later echo time acquisition therefore the Error is largely a measure of the breakdown in the assumption of two components at long echo times (e.g. see Figure 2B). The plots in Figure 4 correspond to the use of five echos in this plot.