\begin{table}%tA.2
  \caption{Instrumental emission lines in the 0.7$-$10.0~keV energy band.}
  \label{tab: lines}
  %\centering
\small
  \begin{tabular}{lclc}
    \hline \hline
    Line & $E$ [keV] & Line & $E$ [keV] \\
    \hline
    Al~K$\alpha$   & 1.487 & Mn~K$\beta$    & 6.490 \\
    Al~K$\beta$    & 1.557 & Fe~K$\beta$    & 7.058 \\
    Si~K$\alpha$   & 1.740 & Ni~K$\alpha$   & 7.472 \\
    Si~K$\beta$    & 1.836 & Cu~K$\alpha$   & 8.041 \\
    Au~M$\alpha$   & 2.110 & Ni~K$\beta$    & 8.265 \\
    Au~M$\beta$    & 2.200 & Zn~K$\alpha$   & 8.631 \\
    Cr~K$\alpha$   & 5.412 & Cu~K$\beta$    & 8.905 \\
    Mn~K$\alpha$   & 5.895 & Zn~K$\beta$    & 9.572 \\
    Cr~K$\beta$    & 5.947 & Au~L$\alpha$   & 9.685 \\
    Fe~K$\alpha$   & 6.400 & & \\
    \hline
  \end{tabular}
\end{table}