n class="p">:]</span> <span class="o">+=</span> <span class="p">(</span>
                            <span class="n">coeffs</span><span class="p">[</span><span class="n">i_stencil</span><span class="p">]</span> <span class="o">*</span> <span class="n">d1</span><span class="p">[</span><span class="mi">0</span><span class="p">,</span> <span class="p">:]</span> <span class="o">/</span> <span class="n">h</span>
                        <span class="p">)</span>
            <span class="n">index</span> <span class