\documentclass[12pt,a4paper]{article}
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\begin{document}
Ο πίνακας ~\ref{tbl:1}
\begin{table}[h]
\begin{tabular}{|p{0.3\linewidth}|m{0.2\linewidth}|p{0.1\linewidth}|}
\hline
cell 1 & cell 2 & cell 3\\
\hline
cell 4 & cell 5 & cell 6\\
\hline
\end{tabular}\label{tbl:1}
\caption{Περιγραφή κελιών}
\end{table}
\end{document}
 
