I wish to type this table in REVTeX; however, the code below does not work for \documentclass{revtex4}. (It does work for the article document class, though.)

\documentclass{revtex4} \usepackage{array,mathtools,amssymb,booktabs} \newcolumntype{C}{>{$}c<{$}} \begin{document} \begin{tabular}{cCCC} \toprule \multicolumn{2}{c}{} & K & H\\\midrule A & a & 1& 4\\\cmidrule(lr){2-4} B & b & 2 & 5\\\cmidrule(lr){1-4} \multicolumn{2}{c}{C}& 3 & 6\\\bottomrule \end{tabular} \end{document} The code is from the source of this page. Thanks to the generous cfr.