\hline, in the row that says , "vehicle parameter". Thank you for suggestions.
Code: Select all
\documentclass[10pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{amsfonts}
\usepackage{amssymb}
\begin{document}
\begin{table}[ht]
\renewcommand{\arraystretch}{1.0}
\caption{Experimentally established prior knowledge [21]} % title of Table
\centering % used for centering table
\begin{tabular}{ccc|ccc}
\hline\hline
\multicolumn{3}{c}{Prior distribution of average road grade (degrees)} & \multicolumn{3}{|c}{Prior distribution of rolling resistance coefficient} \\ \hline
Road grade & Mean & Standard deviation & Road conditions & Mean & Standard deviation \\
Steep-Uphill & 6 & 3 & Sidewalk & 0.056 & 0.025 \\
Uphill & 4 & 2 & Asphalt & 0.062 & 0.026 \\
Flat & 0 & 2 & Tile & 0.066 & 0.025 \\
Downhill & -4 & 2 & Grass & 0.099 & 0.025 \\
Steep-Downhill & -6 & 3 & & & \\ [1ex] \hline
\multicolumn{6}{c}{Vehicle Parameters} \\ [1ex] \hline
& Mean & Standard deviation & & Mean & Standard deviation \\[1ex] \hline
Internal Resistance & 0.22 & 0.003 & Sensors \& Electronics & 28.29 & 1.73 \\ \hline
\end{tabular}
\end{table}[ht]
\end{document}