\begin{table}%T2 \caption{\label{counts}Typical source ($R_{\rm s}$) and background ($R_{\rm b}$) count rates observed with PICsIT (upper part, Rev.~0301) and ISGRI (lower part, Rev.~0079) for sources of 50~mCrab and 2~mCrab strength, respectively. Corresponding numbers of counts, $N_{\rm s}$ and $N_{\rm b}$, were calculated for science windows with a 2 ks exposure time. $S/N$ is the signal-to-noise ratio, and $k_{3\sigma}$ is the number of science windows with the 2 ks exposure time needed to obtain a 3-sigma detection.} \small%\centering \par \begin{tabular}{ccccccc} \hline\hline Energy range & $R_{\rm s}$ & $N_{\rm s}$ & $R_{\rm b}$ & $N_{\rm b}$ & $S/N$ & $k_{3\sigma}$ \\ \multicolumn{1}{c}{[keV]} & [cps] & & [cps] & & & \\ \hline 298--319 & 0.046 & 74 & 52.0 & 104~000 & 0.23 & 170 \\ 433--461 & 0.017 & 24 & 32.0 & 64~000 & 0.10 & 900 \\ 717--816 & 0.010 & 15 & 36.0 & 72~000 & 0.06 & 2500 \\ \hline 22--30 & 0.184 & 294 & 36.0 & 57~600 & 1.22 & 6 \\ 71--80 & 0.019 & 30 & 22.4 & 35~840 & 0.16 & 350 \\ 150--250 & 0.008 & 12 & 53.6 & 86~400 & 0.04 & 5625 \\ \hline \end{tabular} \end{table}