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\usepackage{standalone}
\usepackage{todonotes}
\usepackage{pdflscape}
\usepackage{afterpage}
\usepackage{ifthen}
\usepackage{microtype}
\usepackage{lineno}
\usepackage{xspace}
\usepackage{caption}
\usepackage{graphicx}
\usepackage{color}
\usepackage{colortbl}
\usepackage{amsmath}
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\usepackage{upgreek}
\usepackage{hyperxmp}
\usepackage{hyperref}
\usepackage{hypcap}
\usepackage{cite}
\usepackage{mciteplus}
\usepackage{longtable}

\begin{document}
\begin{tabular}{ccc}\hline
L  &  $B_L$ & $B_L'$ \\ \hline
0  & 1 & 1     \\
1  & $\sqrt{\frac{2z}{1+z}}$ & $\sqrt{\frac{1+z_0}{1+z}}$   \\
2  & $\sqrt{\frac{13z^2}{1+z}}$ & $\sqrt{\frac{(z_0 - 3)^2+9z_0}{(z-3)^2+9z}}$    \\
\hline\hline
\end{tabular}
\end{document}
