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 170
Table title:
Current fleet details
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Class </th><th colspan=1 rowspan=1 > Operator </th><th colspan=1 rowspan=1 > Number </th><th colspan=1 rowspan=1 > Built </th><th colspan=1 rowspan=1 > Carriages </th><th colspan=1 rowspan=1 > Unit nos. </th></tr>
<tr> <td colspan=1 rowspan=2 > 170/1 </td><td colspan=1 rowspan=2 > CrossCountry </td><td colspan=1 rowspan=2 > 17 </td><td colspan=1 rowspan=2 > 1998–99 </td><td colspan=1 rowspan=1 > 3 </td><td colspan=1 rowspan=1 > 170101–110 </td></tr>
<tr> <td colspan=1 rowspan=1 > 2 </td><td colspan=1 rowspan=1 > 170111–117 </td></tr>
<tr> <td colspan=1 rowspan=2 > 170/2 </td><td colspan=1 rowspan=2 > Greater Anglia </td><td colspan=1 rowspan=1 > 8 </td><td colspan=1 rowspan=1 > 1999 </td><td colspan=1 rowspan=1 > 3 </td><td colspan=1 rowspan=1 > 170201–208 </td></tr>
<tr> <td colspan=1 rowspan=1 > 4 </td><td colspan=1 rowspan=1 > 2002 </td><td colspan=1 rowspan=1 > 2 </td><td colspan=1 rowspan=1 > 170270–273 </td></tr>
<tr> <td colspan=1 rowspan=2 > 170/3 </td><td colspan=1 rowspan=1 > Abellio ScotRail </td><td colspan=1 rowspan=1 > 4 </td><td colspan=1 rowspan=1 > 2004 </td><td class="highlighted"  colspan=1 rowspan=2 > 3 </td><td colspan=1 rowspan=1 > 170393–396 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > CrossCountry </td><td class="highlighted"  colspan=1 rowspan=1 > 2 </td><td colspan=1 rowspan=1 > 2002 </td><td class="highlighted"  colspan=1 rowspan=1 > 170397–398 </td></tr>
<tr> <td colspan=1 rowspan=4 > 170/4 </td><td colspan=1 rowspan=3 > Abellio ScotRail </td><td colspan=1 rowspan=1 > 22 </td><td colspan=1 rowspan=1 > 1999–01 </td><td colspan=1 rowspan=4 > 3 </td><td colspan=1 rowspan=1 > 170401–420, 170470–471 </td></tr>
<tr> <td colspan=1 rowspan=1 > 10 </td><td colspan=1 rowspan=1 > 2003–04 </td><td colspan=1 rowspan=1 > 170425–434 </td></tr>
<tr> <td colspan=1 rowspan=1 > 2004–05 </td><td colspan=1 rowspan=1 > 170450–170452 </td></tr>
<tr> <td colspan=1 rowspan=1 > Northern </td><td colspan=1 rowspan=1 > 16 </td><td colspan=1 rowspan=1 > 2004–05 </td><td colspan=1 rowspan=1 > 170453–461, 170472–478 </td></tr>
<tr> <td colspan=1 rowspan=2 > 170/5 </td><td colspan=1 rowspan=1 > West Midlands Trains </td><td colspan=1 rowspan=1 > 17 </td><td colspan=1 rowspan=2 > 1999–00 </td><td colspan=1 rowspan=2 > 2 </td><td colspan=1 rowspan=1 > 170501–517 </td></tr>
<tr> <td colspan=1 rowspan=1 > CrossCountry </td><td colspan=1 rowspan=1 > 6 </td><td colspan=1 rowspan=1 > 170518–523 </td></tr>
<tr> <td colspan=1 rowspan=2 > 170/6 </td><td colspan=1 rowspan=1 > West Midlands Trains </td><td colspan=1 rowspan=1 > 6 </td><td colspan=1 rowspan=2 > 2000 </td><td colspan=1 rowspan=2 > 3 </td><td colspan=1 rowspan=1 > 170630–635 </td></tr>
<tr> <td colspan=1 rowspan=1 > CrossCountry </td><td colspan=1 rowspan=1 > 4 </td><td colspan=1 rowspan=1 > 170636–639 </td></tr>
</table>
Question:
What are the two 3-car units (170397 and 170398) operated by?
Answer:
The two 3-car units (170397 and 170398) are operated by CrossCountry.