n><span class="n">N_chr_beads</span><span class="p">):</span>
        <span class="k">if</span> <span class="n">i</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
            <span class="n">file_write</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="s1">&#39;CRYST1   26.400   26.400   26.400  90.00  90.00  90.00 P 1           1</span><span class="se">\n</span><span class="s1">&#39;</span><span class="p">)</span>
        <span c