\begin{table}%t1
\caption{\label{table_obslog}Overview of instruments that have detected bursts from 4U~0614+091 between 1992 and 2007.}
\par
%\centering
\par
\begin{tabular}{c@{~}c@{~}c@{}c@{}c@{}}
\hline\hline\noalign{\smallskip}
\multicolumn{1}{c}{Time span} &
\multicolumn{1}{c}{Satellite/Instrument} &
\multicolumn{1}{c}{$E_{\rm sens}$\tablefootmark{a}} & 
\multicolumn{1}{c}{$t_{\rm exp}$\tablefootmark{b}} & 
\multicolumn{1}{c}{$n$\tablefootmark{c}} \\
\multicolumn{1}{c}{} &
\multicolumn{1}{c}{} &
\multicolumn{1}{c}{(keV)} &
\multicolumn{1}{c}{(days)} &
\multicolumn{1}{c}{} \\
\hline
Aug. 1992--Jun. 1993 & {\it EURECA}/WATCH & 6--150 & $\sim$50 & 3 \\
Dec. 1995--Aug. 2007 & {\it RXTE}/ASM & 1.5--12 & $\simeq$58 & 7 \\ 
Dec. 1995--Aug. 2007 & {\it RXTE}/PCA & 2--60 & $\simeq$23 & 2 \\ 
Dec. 1995--Aug. 2007 & {\it RXTE}/HEXTE & 15--250 & $\simeq$23 & 2 \\ 
Apr. 1996--Apr. 2002 & {\it BeppoSAX}/WFC & 2--28 & $\simeq$27 & 1 \\
Oct. 2000--Mar. 2007 & {\it HETE-2}/FREGATE & 6--400 & $\sim$194 & 13 \\
Oct. 2002--Aug. 2007 & {\it INTEGRAL}/ISGRI & 15--1000 & $\simeq$22 & 2 \\
Oct. 2002--Aug. 2007 & {\it INTEGRAL}/JEM-X & 3--35 & $\simeq$0.8 & 0 \\
Nov. 2004--Aug. 2007 & {\it Swift}/BAT & 15--150 & $\simeq$26\tablefootmark{d} & 2 \\
\hline
\end{tabular}
\tablefoot {\tablefoottext{a}{Nominal sensitive energy range;}
\tablefoottext{b}{total observation net exposure time;} 
\tablefoottext{c}{number of bursts seen;} 
\tablefoottext{d}{total effective exposure time (corrected for off-axis response).}}
\end{table}