@ {\ hskip} e \ multicolumns

Question

Considere a seguinte tabela

\begin{tabular}{cccccc}
    \toprule
    N   &       \multicolumn3c{L-family}    &   \multicolumn2c{H-family}    \\
    n   &   large   &   Large   &   LARGE   &       huge    &   Huge        \\
    \bottomrule
\end{tabular}

Eu quero enfatizar o agrupamento de colunas, daí a @-construção

\def\htc#1{ {\hskip#1\tabcolsep} }
\begin{tabular}{c  @\htc4  ccc  @\htc4  cc}
    \toprule
    N   &       \multicolumn3c{L-family}    &   \multicolumn2c{H-family}    \\
    n   &   large   &   Large   &   LARGE   &       huge    &   Huge        \\
    \bottomrule
\end{tabular}

Agora eu tenho que ajustar a multicoluna porque o espaço horizontal está desativado

\begin{tabular}{c  @\htc4  ccc  @\htc4  cc}
\toprule
N   &   \multicolumn3{@\htc{-3}c}{L-family} &   \multicolumn2{@\htc0c}{H-family}
\\
n   &   large   &   Large   &   LARGE       &       huge        &       Huge    
\\
\bottomrule
\end{tabular}

Por que as constantes sujas? Isso pode ser feito de forma mais automática?

MWE

\documentclass{article}
\usepackage{booktabs}
\begin{document}

\parskip1em

Consider the following table

\begin{tabular}{cccccc}
    \toprule
    N   &       \multicolumn3c{L-family}    &   \multicolumn2c{H-family}    \\
    n   &   large   &   Large   &   LARGE   &       huge    &   Huge        \\
    \bottomrule
\end{tabular}

~

I want to emphasis the grouping of columns, hence the @-construction

\def\htc#1{ {\hskip#1\tabcolsep} }
\begin{tabular}{c  @\htc4  ccc  @\htc4  cc}
    \toprule
    N   &       \multicolumn3c{L-family}    &   \multicolumn2c{H-family}    \\
    n   &   large   &   Large   &   LARGE   &       huge    &   Huge        \\
    \bottomrule
\end{tabular}

~

Now I have to fine-tune the multicolumn

\begin{tabular}{c  @\htc4  ccc  @\htc4  cc}
\toprule
N   &   \multicolumn3{@\htc{-3}c}{L-family} &   \multicolumn2{@\htc0c}{H-family}
\\
n   &   large   &   Large   &   LARGE       &       huge        &       Huge    
\\
\bottomrule
\end{tabular}

Why the dirty constantss?

\end{document}

PS Nesta questão: Problema com alinhamento ao usar colunas múltiplas e @ {\ hskip}? , A resposta sugere suprimir \tabcolsepusando um vazio @{}. Percebe-se que nem sempre isso dá o resultado desejado.

Answer 1

As @expressões são parte da borda direita da coluna relevante, portanto, ao usar, \multicolumnrepita o componente completo para o período, incluindo sua @expressão à direita :

\documentclass{article}
\usepackage{booktabs}
\def\htc#1{ {\hskip#1\tabcolsep} }
\begin{document}

\parskip1em


I want to emphasis the grouping of columns, hence the @-construction


\begin{tabular}{c  @{\htc4}  ccc  @{\htc4}  cc}
    \toprule
    N   &       \multicolumn{3}{c@{\htc4}}{L-family}    &   \multicolumn{2}{c}{H-family}    \\
    n   &   large   &   Large   &   LARGE   &       huge    &   Huge        \\
    \bottomrule
\end{tabular}


\end{document}