Table I. Effect of model surface volume on derived eCA activity.

Surface Volume	eCA Activity
cm3	cm3 s−1
2.0 × 10−12	7.29 × 10−8
8.2 × 10−12	7.34 × 10−8
4.8 × 10−11	7.31 × 10−8
1.1 × 10−10	7.32 × 10−8