(a) Autocorrelation function computed using the corona response function g(t) (eq. [7]) with ﹩\alpha =0.38﹩, ﹩\beta =10﹩ s, and ﹩t_{0}=0.02﹩ s. (b) The autocorrelation function computed from a model light curve, generated according to eq. (6) with g(t) as above. (c) Same as in (a) plotted in logarithmic time coordinate. (d) Same as in (b) plotted in logarithmic time coordinate.