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\documentclass[a4paper,12pt]{article}\usepackage{multicol}\usepackage{multirow}\usepackage{array}\usepackage[margin=2cm,bottom=2cm]{geometry}\begin{document}\begin{footnotesize} \setlength{\extrarowheight}{2mm}\begin{tabular}{| l | l | l | l | l | l | l | l | l |}\hline& & & \multicolumn{3}{c}{Total colony} & & & \\& & & \multicolumn{3}{c}{forming units per} & & & \\Site & Site name & Transect & \multicolumn{3}{c}{100 mL} & Mean & Variance & Standard \\\cline{4-6}number & & & Depth & Depth & Depth & & & Deviation \\& & & 0 m & 1,5 m & 3 m & & & \\ \hline2 & Møhlenpris & Inner & 20 & 20 & 10 & \multirow{4}{*}{11,25}& \multirow{4}{*}{155,11} & \multirow{4}{*}{12,46} \\ \hline3 & Marineholmen & Inner & $<10$ & $<10$ & 10 & \\ \cline{1-6}4 & Damsgård & Inner & 10 & 10 & 10 & \\ \cline{1-6}5 & Solheimsviken & Inner & $<10$ & 50 & 10 & \\ \hline1 & Nordnes & Outer & 10 & $<10$ & $<10$ & \multirow{2}{*}{10,83} & \multirow{2}{*}{54,17} & \multirow{2}{*}{3,36} \\ \cline{1-6}6 & Laksevåg & Outer & $<10$ & $<10$ & $<10$ & \\\hline\end{tabular}\end{footnotesize}\end{document}