You can also have the border thicker if you supress the outer vlines and hlines, and replace them with an \fbox
with no fboxsep
. I added the vertical alignment of numbers in scientific notation thanks to the numprint
package and its n/N
column types, some more vertical spacing in cells with the cellspace
package — and some colors…
\documentclass[12pt]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{lmodern}
\usepackage{array}
\usepackage{cellspace}
\setlength\cellspacetoplimit{8pt}
\setlength\cellspacebottomlimit{8pt}
\usepackage[autolanguage, np]{numprint}
\usepackage[svgnames, x11names, tables]{xcolor}
\begin{document}
\begin{table}[h]
\centering\setlength\fboxsep{0pt}\setlength\fboxrule{1.5pt}
\fcolorbox{LightSteelBlue3}{White}%
{\begin{tabular}{r!{\color{Salmon1}\vrule width1.2 pt}Sc|c|*{3}{n{1}{1}|}n{1}{1}}%{r@{\hskip\tabcolsep\vrule width1 pt\hskip\tabcolsep}Sl|c|c|c|c|c}%
$x$ & 100 & 10 000 & \np{1e5} & \np{1e6} & \np{1e7} & \np{1e9}\\
\hline
$f(x)$ & 0,1 & 0,0001 & \np{1e-5} & \np{1e-6} & \np{1e-7} & \np{1e-9}
\end{tabular}}
\end{table}
\end{document}

\documentclass{...}
and ending with\end{document}
. – user31729 Apr 25 '14 at 11:59