Not enough vertical spacing with booktabs and siunitx

Question

I am using siunitx and booktabs, but I need a bit more vertical space between my units.

Here is a picture of my problem:

Here is a MWE:

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{siunitx}
\sisetup{range-phrase=-,
            detect-all,
            decimalsymbol=comma,
            round-mode=figures,
            round-precision=3,
            range-units=single,
            per-mode=fraction,}
\usepackage{booktabs}
\begin{document}
\begin{table}[htbp]
    \centering
        \begin{tabular}[]{llr}
            \toprule 
            Parameter & Symbol & Wert   \ 
        \midrule 
            A       &A2         &\SI{1096}{\kg \per \cubic \meter } \ 
            B       &B2         &\SI{0,422}{\watt \per \meter \per \kelvin} \ 
            C       &C2         &\SI{3220}{\joule \per \kg \per \kelvin}    \ 
            D       &D2         &\SI{0,0274}{\kg \per \meter \per \second}      \ 
            \bottomrule
        \end{tabular}
\end{table}
\end{document}

I think what you are looking for is an increased row padding as explained here: https://tex.stackexchange.com/a/31704/118712 — Markus G., Aug 26 '20 at 16:16
On a side note: your first unit should be \kg\per\cubic\metre otherwise the cubic won't be displayed. — Markus G., Aug 26 '20 at 16:16
And if you're looking for a quick-and-dirty solution, try adding [2ex] after each row, like this: A &A2 &\SI{1096}{\kg\per\cubic\meter }\\[2ex] — Markus G., Aug 26 '20 at 16:18
Does this answer your question? Column and row padding in tables — Markus G., Aug 26 '20 at 16:41
Not related: You don't need to put \usepackage[utf8]{inputenc} in modern LaTeX installations. — F. Pantigny, Aug 27 '20 at 08:30

score 3 · Accepted Answer · answered Aug 26 '20 at 17:01

The automatic way uses the cellspace package, which ensures a minimal vertical spacing at the top and bottom of cells in columns with specifier prefixed with a certain letter – default is S, but as you load siunitx, we have to use another letter, definable as an option at loading time. Here is how it goes with your table:

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{siunitx}
\sisetup{range-phrase=-,
            detect-all,
            decimalsymbol=comma,
            round-mode=figures,
            round-precision=3,
            range-units=single,
            per-mode=fraction,}
\usepackage{booktabs}
\usepackage[column=O]{cellspace}
\setlength{\cellspacetoplimit}{3pt}
\setlength{\cellspacebottomlimit}{3pt}
\begin{document}
\begin{table}[htbp]
    \centering
        \begin{tabular}[]{llOr}
            \toprule
            Parameter & Symbol & Wert \
        \midrule
            A &A2 &\SI{1096}{\kg \per \cubic \meter } \
            B &B2 &\SI{0,422}{\watt \per \meter \per \kelvin} \
            C &C2 &\SI{3220}{\joule \per \kg \per \kelvin} \
            D &D2 &\SI{0,0274}{\kg \per \meter \per \second} \
            \bottomrule
        \end{tabular}
\end{table}
\end{document}

score 1 · Answer 2 · edited Aug 27 '20 at 12:53

Bernard has given an answer using cellspace. The package nicematrix (which provides several tools to draw tabulars and mathematical matrices) has a slightly different approach: all the columns of the environments {NiceTabular} of nicematrix are of type 'cellspace' and you have two keys cell-space-top-limit and cell-space-bottom-limit similar to the parameters \cellspacetoplimit and \cellspacebottomlimit of cellspace.

\documentclass{article}
\usepackage{siunitx}
\sisetup{range-phrase=-,
            detect-all,
            decimalsymbol=comma,
            round-mode=figures,
            round-precision=3,
            range-units=single,
            per-mode=fraction}
\usepackage{nicematrix}
\usepackage{booktabs}
\begin{document}
\NiceMatrixOptions{cell-space-top-limit=3pt,cell-space-bottom-limit=3pt}
\begin{table}[htbp]
    \centering
        \begin{NiceTabular}[]{llr}
            \toprule 
            Parameter & Symbol & Wert   \ 
        \midrule 
            A       &A2         &\SI{1096}{\kg \per \cubic \meter } \ 
            B       &B2         &\SI{0,422}{\watt \per \meter \per \kelvin} \ 
            C       &C2         &\SI{3220}{\joule \per \kg \per \kelvin}    \ 
            D       &D2         &\SI{0,0274}{\kg \per \meter \per \second}      \ 
            \bottomrule
        \end{NiceTabular}
\end{table}
\end{document}

score 0 · Answer 3 · answered Aug 26 '20 at 17:12

One possibility is to enlarge `\arraystretch˙and change the way of writing units:

\documentclass{article}
\usepackage{siunitx}
\sisetup{range-phrase=-,
            detect-all,
            decimalsymbol=comma,
            round-mode=figures,
            round-precision=3,
            range-units=single,
            per-mode=symbol,}   % <---
\usepackage{booktabs}
\begin{document}
\begin{table}[htbp]
    \centering
    \renewcommand\arraystretch{1.2} % <---
        \begin{tabular}[]{llr}
            \toprule
            Parameter & Symbol & Wert   \
        \midrule
            A       &A2         &\SI{1096}{\kg \per \cubic \meter } \
            B       &B2         &\SI{0,422}{\watt \per \meter \per \kelvin} \
            C       &C2         &\SI{3220}{\joule \per \kg \per \kelvin}    \
            D       &D2         &\SI{0,0274}{\kg \per \meter \per \second}      \
            \bottomrule
        \end{tabular}
\end{table}
\end{document}

Not enough vertical spacing with booktabs and siunitx

3 Answers3