pzcar

\documentclass{article}

\usepackage[graphicx]{realboxes}

\begin{document}

\begin{table}[ht]

\caption{Nonlinear Model Results} % title of Table

\centering % used for centering table

\begin{tabular}{cccc} % centered columns (4 columns)

\hline\hline %inserts double horizontal lines

Case & Method\#1 & Method\#2 & Method\#3 \\ [0.5ex] % inserts table

%heading

\hline % inserts single horizontal line

1 & 50 & 837 & 970 \\ % inserting body of the table

2 & 47 & 877 & 230 \\

3 & 31 & 25 & 415 \\

4 & 35 & 144 & 2356 \\

5 & 45 & 300 & 556 \\ [1ex] % [1ex] adds vertical space

\hline %inserts single line

\end{tabular}

\label{table:nonlin} % is used to refer this table in the text

\end{table}

\end{document}