How to add a horizontal line in table by using pander or pandoc.table
<p>The header and content of a table generated by pander or pandoc.table is separated by a horizontal line. Is there a way to add a new horizontal line between a specific location in the content? For example:
 <img src="https://i.stack.imgur.com/k2dCZ.jpg" alt="">
Any help is greatly appreciated. Thanks!</p>