Figure 5

Gutenberg data set. Plot of the process \(\log _{10}(D^*_{t,1})-\log _{10}(D^*_{t,2})\) along time. The horizontal dashed red line represents the estimated limit value \({\widehat{u}}=-0.238\).
Gutenberg data set. Plot of the process \(\log _{10}(D^*_{t,1})-\log _{10}(D^*_{t,2})\) along time. The horizontal dashed red line represents the estimated limit value \({\widehat{u}}=-0.238\).