ine"><a name="l00053"></a><span class="lineno">   53</span>&#160;        <span class="keyword">protected</span>:</div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;            <a class="code" href="class_std_vec_3_01_real_01_4.html">StdVec&lt;Real&gt;</a> contact_inv_rho0_;</div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;            StdVec&lt;StdLargeVec&lt;Real&gt; *&gt; contact_mass_;</div><div class="line"><a name="l00056"></a><span class