Reduce left text padding in too-small table cell

horizontal alignmenttablestabularx

Given the following table with the column type C defined so that it has (small) fixed width and supposedly centered text, how can I make it so that the text is actually centered? None of the cell contents will have a length greater than 3 digits with a decimal point.

Using \setlength\tabcolsep{} doesn't work and setting the column type to c has the columns too wide, though p looks essentially identical as the cells are too small to have actually centered text. Using @{} removes all padding along the left side of the cell.

\newcolumntype{C}[1]{>{\centering\arraybackslash}m{#1}}

\begin{table}[]
    \centering
    \begin{tabularx}{\textwidth}{|r||C{.31cm}|C{.31cm}|C{.31cm}|C{.31cm}|C{.31cm}|C{.31cm}|C{.31cm}||}
    
    \cline{1-8}
        \small ---- & \footnotesize0.9 & \footnotesize0.92 & \footnotesize0.99 & \footnotesize1.0 & \footnotesize\textbf{***} & \footnotesize\textbf{***} & \footnotesize\textbf{***}\\
    \cline{1-8}
    
    \end{tabularx}
\end{table}

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Best Answer

What about one of the following two suggestions?

enter image description here

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

\newcolumntype{C}[1]{>{\centering\arraybackslash}m{#1}}

\begin{table}
    \centering
    \setlength{\tabcolsep}{0pt}
    \begin{tabular}{|@{\hspace{6pt}}r@{\hspace{6pt}}||*{7}{>{\footnotesize}C{\dimexpr.31cm+12pt}|}|}
    \cline{1-8}
        \small --- & 0.9 & 0.92 & 0.99 & 1.0 & \textbf{***} &  \textbf{***} & \textbf{***}\\
    \cline{1-8}
    \end{tabular}
\end{table}

\end{document}

\documentclass{article}
\usepackage{array}
\usepackage{calc}
\newlength{\mywidth}

\begin{document}
\begin{table}
    \centering
    \setlength{\mywidth}{\widthof{\footnotesize 0.99}}
    \begin{tabular}{|r||*{7}{>{\footnotesize}wc{\mywidth}|}|}
    \cline{1-8}
        \small --- & 0.9 & 0.92 & 0.99 & 1.0 & \textbf{***} &  \textbf{***} & \textbf{***}\\
    \cline{1-8}
    \end{tabular}
\end{table}

\end{document}
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