an>&#160;                        Real p_star = interface_state.p_;</div><div class="line"><a name="l00252"></a><span class="lineno">  252</span>&#160;                        force -= 2.0 * p_star * e_ij * Vol_i * Vol_k[index_j] * contact_neighborhood.<a class="code" href="class_s_p_h_1_1_neighborhood.html#aef11606a64385d6a5274d830349b7c82">dW_ij_</a>[n];</div><div class="line"><a name="l00253"></a><span class="lineno">  253</span>&#160;                    }</div><div class="line"><a name="l00254"></a><span 