span> <span class="mi">1</span><span class="p">,</span>
                 <span class="n">lon_start_idc</span><span class="p">:</span><span class="n">lon_end_idc</span> <span class="o">+</span> <span class="mi">1</span><span class="p">])</span>
        <span class="n">obs_prime</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">ma</span><span class="o">.</span><span class="n">array</span><span class="p">(</span>
            <span class="n">obs</span><span class="