Uniform and unmagnetized plasma (ΔN = 0 and Ω = 0). We show β distributions of the PDFs of log|E|² (a) and |E| (b) in the Pearson diagram (β₁, β₂), where β₁ is the squared skewness and β₂ is the kurtosis. The arrow indicates that as time advances, skewness and kurtosis increase. The legends in panel (b) list the time intervals [t₀, t₀ + ΔT] used to calculate the PDFs ($\mathrm{\Delta }T=2000{\omega }_{\mathrm{p}}^{-1})$ and indicate the different types of Pearson distributions; regions corresponding to Types I, IV, and VI are indicated in the map with roman numerals (see also Appendix A).