Figure 4.

Histograms (probability density functions $f\left(\left|\Delta v\right|\right)\sim {\left|\Delta v\right|}^{-\mu }$) of the absolute values of the electrical signals |ΔV| plotted with the whole scored time series (N ≈300,000). Plot (a), cold treatment, showing typical cases of exponential distribution (straight line in the log-linear plot, r² ≅ 0.99); plots (b) low light treatment, and (c) osmotic stress by mannitol were plotted as log-log, showing typical power law distributions with the slopes μ = 2.5 ± 0.6 (b) and μ = 2.1 ± 0.3 (c).