Cross sections of processes governing equilibrium distributions of protons and fast hydrogen atoms at low energies: electron capture by p (A.1, dotted blue line), ionisation of H₂ by H_fast (A.2, short dashed orange line), self-ionisation of H_fast (A.3, long dashed red line), and H₂ dissociation by H_fast (A.4, solid green line). The inverse of the proton stopping range, , is also plotted (black dot-dashed line).