">.</span><span class="n">square</span><span class="p">(</span><span class="n">obs_prime</span> <span class="o">-</span> <span class="n">obs_prime_avg</span><span class="p">))</span>
        <span class="n">cac</span><span class="p">[</span><span class="n">i</span><span class="p">]</span> <span class="o">=</span> <span class="n">numerator</span> <span class="o">/</span> <span class="n">np</span><span class="o">.</span><span class="n">sqrt</span><span class="p">(</span><span class="n">denominator</span><span