</span> <span class="o">=</span> <span class="n">dshape</span><span class="p">[</span><span class="o">-</span><span class="mi">2</span><span class="p">]</span> <span class="o">-</span> <span class="mi">1</span> <span class="c1"># wavelength row doesn&#39;t count &amp; only with forward can the input data be spectral</span>
    <span class="n">camout</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">zeros</span><span class="p">(</span><span class="n">dshape</spa