: \documentclass{article} \usepackage{booktabs} \usepackage{subcaption} \captionsetup[subtable]{labelformat=simple, labelsep=colon} \renewcommand{\thesubtable}{Panel~\Alph{subtable}} \begin{document}  \begin{table}[!hbt]   \centering   \begin{subtable}{\linewidth}     \centering     \caption{Unit root tests}     \begin{tabular}{@{\extracolsep{0pt}} lc}       \toprule      Observations & 000\\      Mean & 0.00000\\      Median & 0.00000\\      Maximum & 0.00000\\      Minimun & -0.00000\\      Std. Dev. & 0.00000\\      Skewness & -0.00000 \\      Kurtosis & 0.00000\\       \bottomrule     \end{tabular}   \end{subtable}  \vspace{0.00\baselineskip}    \begin{subtable}{\linewidth}   \caption{Unit root tests}     \centering     \begin{tabular}{@{\extracolsep{0pt}} lc}       \toprule       ADF & -0.0000*** \\       PP & -000.00***  \\       \bottomrule     \end{tabular}   \end{subtable}   \caption{Descriptive statistics and unit root tests} 