Energies normalised to initial beam kinetic energy for Run 1 (top) and Run 2 (bottom). The black lines show the kinetic energy associated with the beam and background electrons (in the x-direction), the red lines the electric field energy (from x,y, and z components when reading from top to bottom) and blue the magnetic field energy (B_z component at ~10^-4, and B_x and B_y components at noise level ~10^-7).