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Thank you very much. Now my table looks much better
I would never have done this my self.
Have a nice day!

Hi
I cannot control the width of my columns. Can you help?

\begin{table}
\centering
\begin{tabular}{|l||r|r||r|r|}\hline
& \multicolumn{2}{|c||}{THD [\%]} & \multicolumn{2}{|c|}{DC offset [mm]} \\\hline
& \multicolumn{1}{|c|}{$\frac{1}{2}\cdot f_S$} & \multicolumn{1}{|c||}{$2\cdot f_S ...