\begin {tabular}{ccc}%
\toprule level&dof&error1\\\midrule %
\pgfutilensuremath {1}&\pgfutilensuremath {4}&\pgfutilensuremath {0.25}\\%
\pgfutilensuremath {2}&\pgfutilensuremath {16}&\pgfutilensuremath {6.25\cdot 10^{-2}}\\%
\pgfutilensuremath {9}&\pgfutilensuremath {2.62\cdot 10^{5}}&\pgfutilensuremath {3.81\cdot 10^{-6}}\\%
\pgfutilensuremath {10}&\pgfutilensuremath {1.05\cdot 10^{6}}&\pgfutilensuremath {9.54\cdot 10^{-7}}\\\bottomrule %
\end {tabular}%
