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. 1997 Mar 1;109(3):385–399. doi: 10.1085/jgp.109.3.385

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Analysis of the function of SR Ca²⁺ pumps in control and at the end of phase 2. (A) Average records from seven fibers of [Ca²⁺]_i after tetanic stimulation in control and at the end of phase 2. Dashed curves obtained by a least square fit of the sum of two exponentials to the records. Tetanic stimulation ended at 0 s. B shows plots of the rate of [Ca²⁺]_i decline (d([Ca²⁺]_i)/dt) vs. [Ca²⁺]_i in control and at the end of phase 2. Data-points for control (○) and end of phase 2 (•) were obtained from fitted curves in A. Curves in B were produced by fitting Eq. 2 to the data-points.