How to add a horizontal line in table by using pander or pandoc.table

Question

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: Any help is greatly appreciated. Thanks!

Solidify

AFAIK pandoc's markdown does not support such markup for tables, so if you need such customization and you are OK with only one output format (eg LaTeX/pdf), then you should rather use xtable or other similar pkg. – Bursitis

@daroczig, thank you. I will try the xtable. – Solidify