Figure 11. The relation between concentrating at 5 min and the Ce⁵⁰for foot analgesia, based on the model shown in Figure 9and Figure 10. Each data point is indicated by a number in parentheses. The number itself is the distance units away from the site of injection. As the samples are drawn closer to the site of foot analgesia (r = 7), the Ce⁵⁰approaches the true value of 200. This figure, based on a model of distance, shows the same pattern as seen in Figure 5with the real data from this study.