204, 51, 204);"><span style="color: rgb(0, 0, 0);">	</span></span><span style="font-style: italic;">% define the angular axis</span><br>&gt;&gt; <span style="color: rgb(51, 102, 255);">xlabel</span>(a,<span style="color: rgb(204, 51, 204);">'Time channel'</span>);<br>&gt;&gt; <span style="color: rgb(51, 102, 255);">setalias</span>(a, <span style="color: rgb(204, 51, 204);">'</span><span style="color: rgb(204, 51, 204);">Wavelength</span><span style="color: rgb(204, 51, 204);">'</span>,<span style="color: rg