Mean electron flux spectrum (left) and X-ray spectrum (right) of a transient initially injected electron beam simulation over 1 s, for the footpoint (orange, green), coronal (black) and total source (blue, purple). Shown are the simulations considering only collisional transport of an electron beam (Beam Only, dashed lines) and the addition of wave-particle interactions (Beam & Waves, solid lines). The vertical dotted lines indicated the energy range a power law was fitted over. The fitted spectral indices are shown in brackets (Beam Only, Beam & Waves).