an style="color: rgb(51, 102, 255);">plot</span>(a,<span style="color: rgb(204, 51, 204);">'plot3'</span>);   <span style="font-style: italic;">% a surface made of lines side by side</span><span style="font-style: italic;"></span>, same as <span style="color: rgb(51, 102, 255);">plot3</span>(a)<br>&gt;&gt; <span style="color: rgb(51, 102, 255);">plot</span>(a,<span style="color: rgb(204, 51, 204);">'scatter3'</span>);<span style="font-style: italic;">% a surface made of colored points</span>, same as <span 