\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}