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

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Long shut events produced by high [Sr²⁺]_i and by [Ba²⁺]_i. (A–C) Sample records were obtained from a BK channel filtered at 10 kHz and digitized at 20 μs; each 40th point is plotted. Membrane voltage and [Sr²⁺]_i are indicated for each trace. (D) Sample record obtained with 5 μM [Ba²⁺]_i and 100 μM [Ca²⁺]_i at 50 mV from a different BK channel. Records were filtered at 10 kHz and digitized at 20 μs; each 100th point is plotted. The zero-current levels are indicated by dotted lines. Arrowheads in D indicate some long shut events shorter than 500 ms.