Figure 24:

The left panel shows cycle periods as functions of Cycle Number. Filled circles give periods determined from minima in the 13-month mean, while open circles give periods determined from the 24-month Gaussian smoothing. Both measurements give a mean period of about 132 months with a standard deviation of about 14 months. The “Wilson Gap” in the periods between 125 and 134 months from the 13-month mean is shown with dashed lines. The right panel shows histograms of cycle periods centered on the mean period with bin widths of one standard deviation. The solid lines show the distribution from the 13-month mean while the dashed lines show the distribution for the 24-month Gaussian. The periods appear normally distributed and the “Wilson Gap” is well populated with the 24-month Gaussian smoothed data.