_1PhysicalProperty_1a8800365ed17c49d1a8e7eb2225bae169"></span><a class="reference internal" href="#_CPPv4N8omexmeta16PhysicalPropertyE" title="omexmeta::PhysicalProperty"><span class="n"><span class="pre">PhysicalProperty</span></span></a><span class="w"> </span><span class="p"><span class="pre">&amp;</span></span><span class="sig-name descname"><span class="k"><span class="pre">operator</span></span><span class="o"><span class="pre">=</span></span></span><span class="sig-paren">(</span><a class="reference 