Integration along the field lines using the differential flux tube volume concept for the work done by the Lorentz force, the pressure gradient force, and the Joule heating (top panel, from left to right), and the changes in rates of magnetic field change, the thermal and the kinetic energy (bottom panel, from left to right) at t = 160 s. The color bars are normalized by power, W. The spatial scale is given in units of L₀ = 500 km.