</p>
        <p>
            For <span class="emphasis"><em>shadow</em></span> forms, when <em class="parameter"><code>compare</code></em> is present, it is used as
            <math overflow="scroll"><msub><mi>D</mi><mi>sub</mi></msub></math>
            and the array layer is specified in <code class="code"><em class="parameter"><code>P</code></em>.w</code>. When <em class="parameter"><code>compare</code></em> is
            not present, the last component of <em class="parameter"><code>P</code></em> is u