\begin{table}%t1
\caption{\label{inst}Instrument characteristics.}
\small
%\centering
\par
\begin{tabular}{cc}
\hline\hline \noalign{\smallskip}
Physical dimensions	& $(28 \times 12 \times 6) ~$cm$^3$ \\
Pupil diameter	& 4 cm \\
Effective area (cm$^2$) & 0.13 (10.3~nm); 0.073 (122~nm) \\
Effective focal length	& 28 cm ($f/\# = 7$) \\
Slit width $\times$ length & 30~$\mu$m $\times$ 1~cm \\
Slit field-of-view & (0.7 $\times$ 20) arcmin$^2$ \\
Grating density	& 4800 lines/mm \\
Detector format 	& 512 pixel \\
Pixel width & 25-$\mu$m  \\
Spectral dispersion & 0.17~\AA/pixel \\
Spectral resolution & 0.4~\AA  \\
Doppler velocity resol. & 115$-$102~km~s$^{-1}$ at 103.2$-$121.6~nm\\
\hline
\end{tabular}
\end{table}