'surfc'</span>);   <span style="font-style: italic;">% a surface with contour plot below</span><span style="font-style: italic;"></span>, same as <span style="color: rgb(51, 102, 255);">surf</span>c(a)<br>&gt;&gt; <span style="color: rgb(51, 102, 255);">plot</span>(a,<span style="color: rgb(204, 51, 204);">'surfl'</span>);   <span style="font-style: italic;">% a surface with light</span><span style="font-style: italic;"></span>, same as <span style="color: rgb(51, 102, 255);">surf</span>l(a)<br>&gt;&gt; <sp