LaTeX Forum

\documentclass[border=2mm]{standalone} 
\usepackage[utf8]{inputenc} 
\usepackage[T1]{fontenc}
\usepackage{amsmath,amssymb}
\usepackage{threeparttable,booktabs}
\usepackage[locale=DE]{siunitx}

\begin{document}
\begin{threeparttable}
\begin{tabular}{*6S} 
\toprule
{$\dfrac{D_{\text{we}}}{D_{\text{pw}}}$}&
{$f_c$}&
{$\dfrac{D_{\text{we}}\cdot\cos\alpha}{D_{\text{pw}}}$}&
\multicolumn{3}{c}{Faktor $f_c$}\\
\cmidrule(lr){4-6}
&
{$\alpha = \SI{90}{\degree}$}&
&
{$\alpha = \SI{50}{\degree}$\,\tnote{a}}&
{$\alpha = \SI{65}{\degree}$\,\tnote{b}}&
{$\alpha = \SI{80}{\degree}$\,\tnote{c}}\\
\cmidrule(lr){1-2}
\cmidrule(lr){3-6}
0,01 & 105,4 & 0,01 & 109,7 & 107,1 & 105,6 \\
\bottomrule
\end{tabular}  
\begin{tablenotes}
\footnotesize
\item[a] Anwendbar für $\SI{45}{\degree} < a < \SI{60}{\degree}$
\item[b] Anwendbar für $\SI{60}{\degree} < a < \SI{75}{\degree}$
\item[c] Anwendbar für $\SI{75}{\degree} < a < \SI{90}{\degree}$
\end{tablenotes}
\end{threeparttable}
\end{document}

\documentclass[border=2mm]{standalone} 
\usepackage[utf8]{inputenc} 
\usepackage[T1]{fontenc}
\usepackage{amsmath,amssymb}
\usepackage{threeparttable,booktabs}
\usepackage[locale=DE]{siunitx}
\usepackage{multirow}
\begin{document}\sffamily
\begin{threeparttable}
\begin{tabular}{SSSSSS} 
\toprule
{\multirow{2}{*}{\(\dfrac{D_{we}}{D_{pw}}\)}}&
{f\(_\text{c}\)}&
{\multirow{2}{*}{\(\dfrac{D_{we}\cdot\cos\alpha }{D_{pw}}\)}}&
&
{Faktor f\(_\text{c}\)}&\\\addlinespace
&
{\(\alpha = \SI{90}{\degree}\)}&
&
{\(\alpha = \SI{50}{\degree}\)\,\tnote{a}}&
{\(\alpha = \SI{65}{\degree}\)\,\tnote{b}}&
{\(\alpha = \SI{80}{\degree}\)\,\tnote{c}}\\
\midrule
0,01 & 105,4 & 0,01 & 109,7 & 107,1 & 105,6 \\
\bottomrule
\end{tabular}  
\begin{tablenotes}
\item[a] Anwendbar für \(\SI{45}{\degree} < a < \SI{60}{\degree}\)
\item[b] Anwendbar für \(\SI{60}{\degree} < a < \SI{75}{\degree}\)
\item[c] Anwendbar für \(\SI{75}{\degree} < a < \SI{90}{\degree}\)
\end{tablenotes}
\end{threeparttable}
\end{document}

% Beispiel
\begin{table}[H]
\begin{center}
\caption{Text}
\begin{footnotesize}
\begin{tabular}{{c}{c|}{c}{c}{c}{c}}
\Xhline{2.5\arrayrulewidth}
$\frac{D_{we}}{D_{pw}}$ & $f_c$ & $\frac{D_{we} \cdot \cos\alpha}{D_{pw}}$ & \multicolumn{3}{c}{$f_c$} \\
    &  $\alpha=90^\circ$     &    &   $\alpha=50^{\circ \,a}$    &   $$\alpha=65^{\circ \,b}$    &  $\alpha=80^{\circ \,c}$ \\ \hline
0,01	& 105,4	&0,01&	109,7&	107,1&	105,6 \\
0,30	& 224,3	&0,30&			\\ \Xhline{2.5\arrayrulewidth} 
$a$ Anwendbar für $45^\circ$ < \alpha < $60^\circ$ \\
$b$ Anwendbar für $45^\circ$ < \alpha < $60^\circ$\\
$c$ Anwendbar für $45^\circ$ < \alpha < $60^\circ$ \\\Xhline{2.5\arrayrulewidth} 
\end{tabular}
\end{footnotesize}
\end{center}
\end{table}
%Ende des Dokumentes [\code]