The vapor fraction of ejecta shows no clear trend with impact parameters. Mass of vaporized ejecta as a fraction of total colliding mass as a function of modified specific impact energy (﹩{Q}_{{\rm{R}}}^{{\prime} }﹩). The shape of symbols corresponds to the mass ratio of the collision and the color corresponds to the impact parameter. The dashed gray line is a power-law fit to the data.