pan>);<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=keyword>if</span>(&nbsp;isempty(&nbsp;l&nbsp;)&nbsp;),<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;l&nbsp;=&nbsp;<span class=graph>plot</span>(&nbsp;x(1),&nbsp;x(3),&nbsp;<span class=quotes>'.-'</span>&nbsp;);<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class=graph>set</span>(&nbsp;l,&nbsp;<span class=quotes>'erasemode'</span>,&nbsp;<span class=quotes>'none'</span>,&nbsp;<span class=quotes>'tag'</span>,&nbsp;<span class=quotes>'brush_stoke'</spa