Mass fraction of a carbon (top panel) and MgSiO3 (bottom panel) dust grain surviving the erosion by kinetic sputtering as a function of its initial velocity vgr(0), as it traverses a gas of pure H, He, and O composition with density ngas = ncloud = 100 cm-3. The vertical line indicates the initial grain velocity for Cas A, vgr(0) = vcloud = 160 km s-1.
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