s="string">'k'</span>,<span class="string">'facecolor'</span>,<span class="string">'interp'</span>);
0055 hold on;
0056 
0057 <span class="comment">% use ginput2 (which allows zooming and plots points as they are clicked) to let</span>
0058 <span class="comment">% user select the boundary points</span>
0059 [xselect] = ginput2(true,<span class="string">'k+'</span>)
0060 
0061 
0062 [npts,jnk] = size(xselect);
0063 
0064 <span class="keyword">if</span>(npts == 0)
0065     fprintf(<span class="string">'you di