Parallel Alfvénic shock with particles injected at a fixed rigidity of R(0) = 10^-2. In contrast to Figs. 11 and 12, the turbulent electric field components for an Alfvén rigidity of R_A = 10^-6 is also included. The figure shows how initially the acceleration process yields similar results to the simulation without electric fields. However, over time, the stochastic acceleration process influences the form of the spectra heavily, with a flux peak forming at around R/R₀ ≈ 15.