Time evolution of volume-integrated dissipation rates for the ABC and OT, P_m = 1 runs. The blue line is the time derivative of the integrated isothermal generalised mechanical energy . The orange curve is the sum of the physical viscous and ohmic dissipations computed from the velocity and magnetic fields (Eqs. (11) and (12), respectively). The green line is the volume-integrated corrected dissipation field determined by our recovery method (see text and Appendix B). We note that the timescale is in units of initial turnover timescale; we display t/t_turnover where . We also show the evolution of the r.m.s. sonic Mach number ℳs (red curve); its scale corresponds to the right axis.