Code:
\documentclass[headsepline, plainheadsepline, pagesize=pdftex, paper=a4, fontsize=12pt, headings=small, DIV=12, bibliography=totoc, footinclude=false, captions=tableheading, BCOR=0.5cm, draft=false]{scrreprt}
%---------------------------------------------------------------------------
% FONTS Libertinus
%---------------------------------------------------------------------------
\usepackage{fontspec}
\usepackage{metalogo} % Für die Logos von \LaTeX \XeTeX usw.
\usepackage{amsmath} % Displayed equations
\usepackage{amssymb} % and additional symbols
\usepackage{amsfonts}
\usepackage{trace}
\usepackage{amsthm}
\usepackage{unicode-math}
\setmainfont[Contextuals=Alternate,Numbers={OldStyle,Proportional}, Ligatures={TeX, Common}
]{Libertinus Serif}
\setmonofont[Scale=0.8]{Libertinus Mono}
\setsansfont{Libertinus Sans}
\setmathfont{Libertinus Math}
%---------------------------------------------------------------------------
\usepackage[ngerman]{babel}
\usepackage[automark]{scrlayer-scrpage}
\usepackage{tabu, longtable}
\usepackage{booktabs, tabularx,ragged2e}
\usepackage[justification=RaggedRight]{caption}
\usepackage{graphicx}
\usepackage{typearea}
\usepackage{array, eqlist, paralist}
\usepackage{rotating, multirow}
\usepackage{natbib}
\usepackage{url, soul}
\usepackage[babel]{microtype}
\usepackage{eurosym}
\usepackage[labelfont=sf, font=small]{subfig}
\usepackage[percent]{overpic}
\usepackage[table]{xcolor}
\usepackage{pdfpages, marginnote}
\usepackage{placeins}
\usepackage{setspace}
\onehalfspacing
\usepackage[version=3]{mhchem}
\usepackage{textcomp}
\usepackage[version-1-compatibility,copy-decimal-marker, locale=DE]{siunitx}
\begin{document}
\begin{table}[tbp]
\centering
\caption{Tabelle 1}
\begin{tabular}{lS[table-format=2.3]}
\toprule
{Spalte A} & {Spalte B} \\ \midrule
0 & 0,45 \\
16 & 16,87 \\
17 & 17,0 \\
18 & 18 \\
1 & 1,11 \\
2 & 2,22 \\
3 & 3,33 \\
4 & 4,44 \\
5 & 5,551 \\
6 & 6,1 \\
7 & 7,23 \\
8 & 8,312 \\
9 & 9 \\
10 & 10,0 \\
11 & 11,4 \\
12 & 12 \\
13 & 13,9 \\
14 & 14 \\
15 & 15,0 \\
\bottomrule
\end{tabular}
\end{table}
\end{document}
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