Relations between solar activity and complexity parameters: all curves have been smoothed by a yearly running average of the values of γ and D (black curves) on the left axis and S_n (blue curves) on the right. Horizontal dashed black lines indicate the limit γ_un between chaotic and stochastic information in (a) and the upper half of the reversibility range over the continuous black line in (b). Vertical dashed blue lines delimit solar cycles 23 and 24. The colored blocks represent the phases of the solar cycles. The red circles mark the peaks of the D values at solar maxima. The time period is from 5 Aug 1995 to 29 May 2019.