)</span><span class="o">+</span><span class="n">U_Z</span><span class="p">(</span><span class="n">cc</span><span class="p">)</span><span class="o">*</span><span class="n">U_Z</span><span class="p">(</span><span class="n">cc</span><span class="p">))</span>

       <span class="n">V_X</span><span class="p">(</span><span class="n">cc</span><span class="p">)</span><span class="o">=</span><span class="n">U_X</span><span class="p">(</span><span class="n">cc</span><span class="p">)</span><span class="o">/</span><s