t to this file (filename as string,</span>
<span class="sd">        or writeable file handle)</span>
<span class="sd">    chain : str or dict(str -&gt; str), optional (default: None)</span>
<span class="sd">        PDB chain(s) that should be targeted by line drawing</span>

<span class="sd">        * If None, residues will be selected</span>
<span class="sd">          py position alone, which may cause wrong assignments</span>
<span class="sd">          if multiple chains are present in the structure.</spa