Figure from L.V.Zhigilei and B.J.Garrison, Pressure waves in microscopic simulations of laser ablation, in Multiscale Modelling of Materials, edited by T. Diaz de la Rubia, T. Kaxiras, V. Bulatov, N.M.Ghoniem, and R. Phillips, (Mat. Res. Soc. Symp. Proc. 538), 491-496, 1999.