chema for the <code>regions.bed</code> file is below:</p>
<div class="table-wrapper"><table><thead><tr><th>col</th><th>Name</th><th>Description</th><th>type</th></tr></thead><tbody>
<tr><td>1</td><td>chrom</td><td>chromosome of the region</td><td>str</td></tr>
<tr><td>2</td><td>start</td><td>0-based start position of the region</td><td>int</td></tr>
<tr><td>3</td><td>end</td><td>0-based end position of the region</td><td>int</td></tr>
<tr><td>4</td><td>region_name</td><td>name of the region from the input B