Distributions of asymmetry ratios for the two‐sided exponential model. The larger of the rise or fall time was divided by the other, and the distributions of these ratios were plotted. While the slopes are similar, the curve for shots with a slow rise and quicker fall (black) is higher than that for shots with a quick rise and slow fall (gray) everywhere that the difference is significant; i.e., the gray curve is never above the black one by more than the standard deviation.