Line ratios to Hβ λ4861 versus shock velocity according to the MAPPINGS III code for LMC abundances, magnetic field strength of 10^-4μG and an ambient density of 1 cm^-3 for the shock component only. Points are numeric data and lines represent interpolated curves. Values are normalized to their results for v_s = 150 km s^-1. Colors identifying each line ratio are the same as in Fig. 13.