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. 1998 Feb 1;111(2):363–379. doi: 10.1085/jgp.111.2.363

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Response of a single BK channel to voltage steps under the presence of Sr²⁺ or Ca²⁺. (A and B) Three sample records (a) and the average trace (b) under the presence of 20 μM [Sr²⁺]_i (A) and 5 μM [Ca²⁺]_i (B). Number of traces used to obtain the average: 100 and 160 in A and B, respectively. The time constants of single-exponential curves that fit the activation and tail-decay time courses (dotted curves) were 1.22 and 0.61 ms, respectively, in A, and 1.14 and 0.54 ms, respectively, in B.