Basically, I have a table (from a file) containing only numeric values. I would like to import in latex but it has to be formatted in a specific way, as illustrated by the picture.
The ... should be replaced by the table content. For example, I have filled the 'Line 1' field with some values coming from the table.

I know that pgfplotstable is a very powerful too but I can't figure how to import it correctly.
The code :
\documentclass{standalone}
\usepackage{filecontents,pgfplots}
\begin{filecontents}{example.dat}
1.23 2.34 %first line
2.45 6.54 %first line
4.56 4.43 %first line
%Also numeric values for the Line 2 and Line 3
\end{filecontents}
\begin{document}
\begin{tabular}{|c|p{3cm}|p{3cm}|}
\hline
& Column 1& Column 2\\\hline
Line 1 & 1.23\newline 2.45\newline4.56 &2.34\newline 6.54\newline4.43 \\\hline
Line 2 & ...\newline ...\newline... &...\newline ...\newline...\\\hline
Line 3 & ...\newline ...\newline... &...\newline ...\newline...\\\hline
\end{tabular}
\end{document}
