Fig. 6
From: Stability and symmetry of ion-induced surface patterning
a Comparison of the initial surface with the final surface profiles under both linear and nonlinear evolution, with nonlinear term plotted to show the wavelength magnitude. The original surface is a series of 4 gaussian bumps. b Evolution of a gaussian bump surface profile using the linear form of the evolution equation (top) and nonlinear term included (bottom), showing the influence of the nonlinear term. All units shown are in [m]