Evolution of the spectra (compensated by k^5/3) of kinetic energy (black) and magnetic energy (blue), for different sets of initial Reynolds numbers (Re,Rm) (shown as green triangles in Fig. 1), for the weakly nonlocal Sabra model. The spectra are averaged over ten independent runs and are plotted at time intervals shown as Δt in the plot titles. The different shades are a guide for understanding the direction of time (from black to gray and from dark to light blue, cycling every five spectra).