siglay'</span>) &amp;&amp; isfield(Mobj, <span class="string">'siglev'</span>)
0180         siglev = Mobj.siglev(obc_nodes, :);
0181         siglay = Mobj.siglay(obc_nodes, :);
0182     <span class="keyword">else</span>
0183         warning(<span class="string">'Assuming uniform terrain-following sigma coordinates'</span>)
0184         inc = 1/real(nSiglay);
0185         siglev = 0:-inc:-1;
0186         siglay = nan(1, nSiglay);
0187     <span class="keyword">end</span>
0188 
0189     <span class="keyword">