\begin{table}%t2
\caption{\label{tab:Iqueye}Main characteristics describing the performance of Iqueye
applied to NTT.}
  %\centering
\par
 \begin{tabular}{ll}
  \hline\hline
  System sensitivity & Photon counting \\
  \hline
  Relative time accuracy & 100 ps (for 1 h  of continuous observation) \\
  Absolute time accuracy & 500 ps (for 1 h  of continuous observation) \\
  Dark count rate & $<$100~Hz \\
  Maximum count rate & 8 MHz \\
  Dynamic range & $> $40~dB \\
  Limiting magnitude & $m_V = 24$ with 2 h exposure time and $S/N = 10$ \\
  Effective field of view & (selectable) 3.5, 5.2, or 6.1~arcsec \\
  Operative spectral range & $\Delta\lambda = [350,925]$ nm (see Table~\ref{tab:filters} for filter details) \\
  System total efficiency & 33\% (peak @ 550 nm) \\
  & 18\% (average over $\Delta\lambda = [350,925]$ nm spectral range) \\
  \hline
 \end{tabular}
\end{table}