pan class="cn">NULL</span>,</span>
<span>  max_age <span class="op">=</span> <span class="fl">3600</span> <span class="op">*</span> <span class="fl">24</span> <span class="op">*</span> <span class="fl">7</span>,</span>
<span>  west <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  east <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  south <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  north <span class="op">=</span> <span class="cn">NULL</s