>a,&nbsp;<span class="keywordsign">'</span>b,&nbsp;<span class="keywordsign">'</span>c)&nbsp;<span class="constructor">Bigarray</span>.<span class="constructor">Array1</span>.t<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">val</span>&nbsp;map_file&nbsp;:<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="constructor">Unix</span>.file_descr&nbsp;<span class="keywordsign">-&gt;</span><br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;?pos:int64&nbsp;<span class="keywordsign">-&