our'</span>); <span style="font-style: italic;">% contour plot</span>, same as <span style="color: rgb(51, 102, 255);">contour</span>(a)<br>&gt;&gt; <span style="color: rgb(51, 102, 255);">plot</span>(a,<span style="color: rgb(204, 51, 204);">'contourf'</span>);<span style="font-style: italic;">% contour plot with filled regions</span>, same as <span style="color: rgb(51, 102, 255);">contour</span>f(a)<br>&gt;&gt; <span style="color: rgb(51, 102, 255);">plot</span>(a,<span style="color: rgb(204, 51, 204);">