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As for Fig. 8, except that the volume considered is now a box of dimensions 1-μm long, 120-nm wide, and 30-nm high situated 85 nm above the presynaptic membrane and hence surrounding all the high-affinity sites. Because the box includes pumps only on its ends and does not include the low calcium-affinity site, panels corresponding to D and E in Fig. 8 have been omitted.
