Table 2. The properties of Ca²⁺ sparks recorded from subsarcolemmal and central regions of permeabilized atrial myocytes.

Linescan position and SR type	Amplitude (F/F0)	Spatial width (μm)	Duration (ms)	Frequency (sparks s−1 (100 μm)−1)	n
Subsarcolemmal, j-SR	1.83 ± 0.02	1.68 ± 0.04	30.4 ± 0.4	8.5 ± 1.3	329
Central, nj-SR	1.96 ± 0.03	1.75 ± 0.04	31.5 ± 0.5	9.6 ± 0.4	379