%% 
%%  A DANTE-Edition example
%% 
%%  Example 06-00-16 on page 186.
%% 
%%  Copyright (C) 2010 Herbert Voss
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 
%% 
%% ==== 
% Show page(s) 1
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\documentclass[]{article}
\pagestyle{empty}
\setlength\textwidth{201.70511pt}
\setlength\parindent{0pt}
\usepackage[utf8]{inputenc}
\usepackage[ngerman]{babel}

\usepackage{array,booktabs,dcolumn,ragged2e} \newcolumntype{N}{>{\footnotesize}l}
\newcolumntype{P}[1]{>{\footnotesize\RaggedRight\hspace{0pt}}p{#1}}
\newcolumntype{d}[1]{D{.}{,}{#1}}  \newcommand\mc[2]{\multicolumn{1}{#1}{#2}}

\begin{document}
\begin{tabular}{@{}l *{6}{d{3.0}} @{}}\toprule
\mc{@{}N}{Zeit} & \multicolumn{2}{N}{Material von Drischel}
  & \multicolumn{2}{N}{Material von Bauer} & \multicolumn{2}{N@{}}{Eigenes Material}\\
    \cmidrule(lr){2-3}\cmidrule(lr){4-5}\cmidrule(l){6-7}
  & \mc{P{3.5em}}{Häufigster Wert} & \mc{P{3.5em}}{Extremwert}
  & \mc{P{3.5em}}{Häufigster Wert} & \mc{P{3.5em}}{Extremwert}
  & \mc{P{3.5em}}{Häufigster Wert} & \mc{P{3.5em}@{}}{Extremwert}\\
    \cmidrule(r){1-1}\cmidrule(lr){2-2}\cmidrule(lr){3-3}\cmidrule(lr){4-4}%
    \cmidrule(lr){5-5}\cmidrule(lr){6-6}\cmidrule(l){7-7}\addlinespace
Latenzzeit    & 220 & 330 & 245 & 325 & 235 & 320 \\
              &     & 150 &     & 155 &     & 160 \\\addlinespace
Halbwertszeit & 210 & 380 & 145 & 535 & 180 & 320 \\
des Abstiegs  &     &  90 &     &  95 &     &  70 \\\addlinespace
Gipfelzeit    & 485 & 700 & 375 & 535 & 420 & 600 \\
              &     & 260 &     & 315 &     & 290 \\\addlinespace
Halbwertszeit & 855 & 870 & 665 & 945 & 775 & 820 \\
des Abstiegs  &     & 590 &     & 575 &     & 490 \\\addlinespace\bottomrule
\end{tabular}
\end{document}