\begin{table}%T1 
\caption{\label{lines}Strongest PICsIT background lines seen in the spectra collected during 
non-flaring Sun periods. The most probable line origin is listed first. 
$T_{1/2}$ is the half-life decay time of a given isotope. Lines around 670 and 
690~keV form the 680~keV complex (see text).}
\small%\centering
\par
\begin{tabular}{cccc}
\hline\hline
Energy & Catalog energy & Isotope & $T_{1/2}$ \\
\multicolumn{1}{r}{[keV]} & [keV] & & \\
\hline
 510 &  511.0 & $e^{+}e^{-}$ & --- \\
 670 &  666.3 &  $^{126}$I & 13 d \\ 
     &  667.7 & $^{132}$Cs &  7 d \\
     &  666.3 & $^{126}$Sb & 12 d \\
 690 &  695.0 & $^{126}$Sb & 12 d \\
     &  685.7 & $^{127}$Sb &  4 d \\
     &  703.4 & $^{205}$Bi & 15 d \\
1780 & 1779.0 &  $^{28}$Al &  2 m \\
     & 1757.6 &  $^{57}$Ni & 36 h \\
     & 1771.4 &  $^{56}$Co & 77 d \\
2750 & 2754.0 &  $^{24}$Na & 15 h \\
\hline 
\end{tabular}  
\end{table}