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% Plots six key statistics of secondary eyewall replacements (SERs). The
% first plot just shows the probability of storms with the number of SERs
% given on the x axis. The second plot shows the mean and standard
% deviation of lifetime maximum wind speed among the events with the number
% of SERs given on the x axis. The third plot shows the mean and standard
% deviation of wind speed integrated over the life of each event, among the
% events with the number of SERs given on the x axis. The final three plots
% are identical to the first three except that they show statistics of
% _“primary eyewall replacements”_ (PERs), which occur when a new eyewall
% forms inside an existing eyewall and eventually replaces it. This
% phenomenon happens during the decay phase of some simulated tropical
% cyclones.