Guitar Nebula: Color map of the ratio, γ_esc/γ_MPD (base-10 logarithm, left panel), and the efficiency, ϵ (right panel), as a function of the pulsar velocity, V_psr (within the estimated uncertainty; de Vries et al. 2022), and the ambient number density, n_ISM. The black curve shows the relation we used to estimate n_ISM (pressure equilibrium at the bow shock standoff distance, d₀). The black points indicate the position of the system for the best estimate of V_psr (and n_ISM).