Fig. 8

Height data for the surface profiles of the (a) original surface prior to evolution, and surface after 60 h of evolution using (b) the linear evolution equation and (c) nonlinear evolution equation. The surface height is normalized to the maximum height, where average height of the surface is 0. The peaks are shown by the red regions while the troughs are shown as blue. The x- and y-axes are expressed in [m] to show the feature size. The evolution parameters are as shown in Table 1. θ=0°