Volume 402 (2007), pp. 439–447

The axes in several figures were mislabelled or ambiguously labelled. The correct labels are listed below. These errors do not affect the interpretation of the results.

In Figure 1(A), the y-axis label should be Vi (/sec).

In Figure 1(B), the y-axis label should be kobs (/msec).

In Figure 4, the y-axis label should be Vi (/sec).

In Figure 6, the y-axis label should be kobs (/sec).