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Shot-noise estimates, quantal size (A, qsize), quantal rate (B, qrate) and quantal standard deviation (C, qsd) vs. normalized coefficient of variation (CV*) for resting discharge; 2 exemplar units (*); 4 units with unreliable qrates (○), >10,000/s. All regressions, df = 20. A: log(qsize) vs. log (CV*), t = 3.9, P < 0.002; B: log(qrate) vs. log(CV*), t = −4.9, P << 0.001; C: qsd vs. log (CV*), t = 1.5, P > 0.1.
