# Undefined control sequence with table xcolor package

I'm trying to colour some cells in a table. I've read that I need to use the package [table]xcolor, but my file is not compiling when I insert that package, I get an undefined control sequence type of error, even without trying to colour any cells. My code is

\documentclass[aps]{revtex4}
\usepackage[table]{xcolor}

\begin{document}

\begin{table}[h!]
\begin{tabular}{c | c | c}

N & 2 & 3 \\

2 & MS & MS \\

\end{tabular}
\end{table}

\end{document}


which does not compile, but if you comment the line \usepackage[table]{xcolor}, it does compile. The error I get is very long, it starts with:

! Undefined control sequence.
\CT@setup ->\@tempdimb \col@sep
\@tempdimc \col@sep \def \CT@color {\global ...
l.7 \begin{tabular}{c | c | c}
...


Any solution?

• Welcome to TeX.SX! Any reason for using the obsolete revtex4 class instead of revtex4-1? Jun 21, 2017 at 15:21
• No, and this already solved the issue, thanks :) Jun 21, 2017 at 15:26

The revtex4 class is incompatible with colortbl, because it redefines the tabular environment so \col@sep gets undefined. This is an important dimension register defined in the array package, which colortbl relies upon.

The class is, however, obsolete and remains for back compatibility. The revtex4-1 class doesn't suffer from the problem.

\documentclass[aps]{revtex4-1}
\usepackage[table]{xcolor}

\begin{document}

\begin{table}[htp!]% <------ Never just h!
\begin{tabular}{c | c | c}

N & 2 & 3 \\

2 & MS & MS \\

\end{tabular}
\end{table}

\end{document}