Example for beautiful LateX tables

mytable.tex

\documentclass{scrreprt}

\usepackage{booktabs}
\usepackage{isotope}
\usepackage{siunitx}
\sisetup{
 	per-mode = fraction, 
 	load-configurations = abbreviations,
}

\begin{document}

\begin{table}[!hb]
\centering
\captionabove{Some caption for the table}\label{tab:mytable}
\begin{tabular}{
	S |
	S[separate-uncertainty = true] |
	S[table-format = 5] |
	S
}
\toprule
{Id} & {$N_T$ \isotope[4]{He} [\SI{e15}{atoms\per\square\cm}]} & {$E_p$ [keV]} & {Something $\Delta E$ [keV]}\\
\midrule
1 & 1234(567) & 10  & 34(7) \\
2 & 8900(200) & 200 & 27(6) \\
3 & 3570(170) & 3000 & 21(6) \\
4 & 1590(420) & 40000 & 22(5) \\
\bottomrule
\end{tabular}
\end{table}

\end{document}