Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
British Rail Class 421
Table title:
8Mig units
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=2 > 8Mig unit No. </th><th colspan=5 rowspan=1 > 4Cig unit </th><th colspan=1 rowspan=2 > RMB coach </th><th colspan=4 rowspan=1 > 3Cig unit </th></tr>
<tr> <th colspan=1 rowspan=1 > Unit no. </th><th colspan=1 rowspan=1 > DTCsoL </th><th colspan=1 rowspan=1 > MBSO </th><th colspan=1 rowspan=1 > TSO </th><th colspan=1 rowspan=1 > DTCsoL </th><th colspan=1 rowspan=1 > Unit no. </th><th colspan=1 rowspan=1 > DTCsoL </th><th colspan=1 rowspan=1 > MBSO </th><th colspan=1 rowspan=1 > DTCsoL </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2601 </td><td colspan=1 rowspan=1 > 7401 </td><td colspan=1 rowspan=1 > 76751 </td><td colspan=1 rowspan=1 > 62389 </td><td colspan=1 rowspan=1 > 71069 </td><td colspan=1 rowspan=1 > 76822 </td><td colspan=1 rowspan=1 > 1872 </td><td colspan=1 rowspan=1 > 7402 </td><td colspan=1 rowspan=1 > 76752 </td><td colspan=1 rowspan=1 > 62390 </td><td colspan=1 rowspan=1 > 76823 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 2602 </td><td colspan=1 rowspan=1 > 7403 </td><td colspan=1 rowspan=1 > 76753 </td><td colspan=1 rowspan=1 > 62391 </td><td colspan=1 rowspan=1 > 71071 </td><td colspan=1 rowspan=1 > 76804 </td><td colspan=1 rowspan=1 > 1873 </td><td colspan=1 rowspan=1 > 7404 </td><td colspan=1 rowspan=1 > 76754 </td><td colspan=1 rowspan=1 > 62392 </td><td colspan=1 rowspan=1 > 76825 </td></tr>
</table>
Question:
How were the two 8mig units numbered?
Answer:
The two 8Mig units were numbered 2601–2602.