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I have a LaTeX document and want to change the thickness of \toprule and \bottomrule to 1.5pt. Is there a way to do this with the \renewcommand or do I have to change every \toprule to \toprule[1.5pt]?

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Welcome to TeX.sx! A tip: You can use backticks ` to mark your inline code as I did in my edit. – Torbjørn T. Feb 22 '13 at 14:10
1.5pt would show very thick rules. – egreg Feb 22 '13 at 14:15
up vote 6 down vote accepted

The default width of those rules is defined by the length \heavyrulewidth, so you can change this with \setlength\heavyrulewidth{<length>}. For example


Some text \\
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