如何在列标签之间添加空格？

Question

我想在列标签状态、输入和输出之间添加一些空间。现在它们非常接近，所以看起来不太好。我该怎么做才能添加一些空间？

\documentclass[12pt]{article}
\usepackage[utf8]{inputenc}
\usepackage{float}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage[colorlinks,citecolor=blue,linkcolor=blue,bookmarks=false,hypertexnames=true]{hyperref} 
\usepackage{algorithm}
\usepackage{graphicx}
\usepackage{rotating,booktabs,multirow}

\usepackage[T1]{fontenc}
\usepackage{fix-cm}
\setlength{\tabcolsep}{0.7pt}


\begin{table*}[t]
\centering
\begin{tabular}{c c c c c c c c}
\midrule
\multicolumn{3}{c}{} & \multicolumn{2}{c}{Freezed } &\multicolumn{2}{c}{Solid SF} \\ 
\cmidrule(r){4-7}
 States & Inputs & Outputs & Length & Time & Length & Time \\ 
\cmidrule(r){1-4}\cmidrule(l){4-7}
\multirow{1}{*}{4096}& 2 &  2 & 21.47 & 63327.2 & 21.62 & 52520.84 \\
\midrule
\bottomrule
\end{tabular}

\caption{Averages of experiments}
\label{tab:t3}
\end{table*}
\end{document}

Answer 1

请勿修改\tabcolsep

 %\setlength{\tabcolsep}{0.7pt}

空间这么小，就没有意义了。

Answer 2

大部分都是题外话（因为主要问题已经解决了赫伯特答案）然而我在表格的代码中看到更多问题。我想对其进行如下修改：

\documentclass[12pt]{article}
%\usepackage[utf8]{inputenc} % now id default
\usepackage[T1]{fontenc}
\usepackage{fix-cm}
\usepackage{float}
\usepackage{amsmath}
\usepackage{amsthm}
\usepackage{algorithm}
\usepackage{graphicx}

\usepackage{booktabs, multirow, rotating}
\usepackage[colorlinks,citecolor=blue,linkcolor=blue,bookmarks=false,hypertexnames=true]{hyperref} % had to be last in preamble

\begin{document}
\begin{table*}[t]
    \centering
\begin{tabular}{c c c c c c c c}
    \toprule
\multicolumn{3}{c}{} & \multicolumn{2}{c}{Freezed} & \multicolumn{2}{c}{Solid SF} \\
    \cmidrule(r){4-5}\cmidrule(l){6-7}
 States & Inputs & Outputs & Length & Time & Length & Time \\
    \midrule
4096    & 2 & 2 & 21.47 & 63327.2 & 21.62 & 52520.84 \\
\bottomrule
\end{tabular}

\caption{Averages of experiments}
\label{tab:t3}
\end{table*}
\end{document}

如果您的表格有更多（很多）行，您应该考虑使用能够S在小数点对齐数字的列类型：

 ...
\usepackage {siunitx}
...

\begin{document}
\begin{table*}[t]
    \centering
\begin{tabular}{c cc S[table-format=2.2]
                     S[table-format=5.1]
                     S[table-format=2.2]
                     S[table-format=5.2]
                }
    \toprule
\multicolumn{3}{c}{} & \multicolumn{2}{c}{Freezed} & \multicolumn{2}{c}{Solid SF} \\
    \cmidrule(r){4-5}\cmidrule(l){6-7} % changed
 States & Inputs & Outputs & {Length} & {Time} & {Length} & {Time}      \\
    \midrule
4096    & 2      & 2       & 21.47   & 63327.2 & 21.62    & 52520.84    \\
\bottomrule
\end{tabular}