Let's take the following example:

Example table

Using Lyx, how can I make the top and the bottom border thicker than the bottom border of the header row?

  • 2
    This might help? wiki.lyx.org/LyX/Tables#toc8 – phx Jul 9 '15 at 14:09
  • In LaTeX the solution is to load the booktabs package, and use \toprule, midrule and bottomrule. There is also a \cmidrule for partial rules. See details in the doc. – Bernard Jul 9 '15 at 17:24

Since the OP responded to my comment that it was the correct solution to his problem I just repost it as an answer:

Formal-style tables using booktabs

The http://en.wikibooks.org/wiki/LaTeX/Tables#Professional_tables "booktabs" package gives a professional look by not using vertical borders and by adjusting the spacing above and below the horizontal borders. To enable the "booktabs" style, right-click the table and select "Settings." Under the "Borders," tab, in the "Style" box, select the "Formal" bullet. Hover over the bullet to see a description: "Use the formal (a.k.a. booktabs) border style (no vertical borders)." In addition to not using vertical borders by default, the booktabs style adjusts the horizontal border widths and the spacing to create a professional-looking table.

This description was taken from the LyX wiki.

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