requency</span>
        last_search <span class="string">double</span>  <span class="string">=</span> <span class="string">double.empty</span>;    <span class="comment">% last step when search was executed over all elements (double to allow inf value)</span>

        <span class="comment">% Base objects for kinematics</span>
        kinpp_sph      <span class="string">BinKinematics</span> <span class="string">=</span> <span class="string">BinKinematics.empty</span>;   <span class="comment">% sphere particle