Electron and ion particle velocity distribution functions for guide-field cases of 0B_P and 0.6B_P in the 2.5D simulation runs. Black lines show the distribution functions at the beginning of the respective simulation. The dark grey lines show the distribution functions at peak reconnection, i.e. t = 250 /ω_pe for zero guide-field and 425 /ω_pe for the 0.6B_P guide-field case. The light grey lines show distribution functions at the end of the simulation, i.e. t = 500 /ω_pe. The particles included in the plots were chosen from an area around the diffusion region, i.e. (− 2c/ω_pe) <x< (2c/ω_pe) and (− 8c/ω_pe) <y< (8c/ω_pe).