span class="op">|&gt;</span></span>
<span>  <span class="fu"><a href="../reference/add_equation.html">add_equation</a></span><span class="op">(</span><span class="st">"C_d = alpha1 * Yd_e + alpha2 * H_h[-1]"</span><span class="op">)</span> <span class="op">|&gt;</span></span>
<span>  <span class="fu"><a href="../reference/add_equation.html">add_equation</a></span><span class="op">(</span><span class="st">"H_s = G_d - T_d + H_s[-1]"</span><span class="op">)</span> <span class="op">|&gt;</span></span>
<span> 