\begin{table}%t3
\caption{\label{tab:snrs}Detailed view of the various contributors to the noise budget, given in photo-electrons persecond over the 6--20~$\mu$m wavelength range for \darwin/TPF in the Emma X-array configuration.}
%\centerline
 {\begin{tabular}{l c c c c}
    \hline
    \hline
      & M0V -- 05pc & K0V -- 10~pc & G2V -- 15~pc & F0V -- 20~pc \\
    \hline
    Optimum baseline [m]  & 25 & 22 & 22 & 11  \\
    Planetary modulation efficiency  & 0.57 & 0.58 & 0.58 & 0.58  \\
    Planetary coupling efficiency & 0.76 & 0.76 & 0.76 & 0.75  \\
    \hline\noalign{\smallskip}
    Stellar signal [e-/s]          & $2.6 \times 10^7$ & $2.1 \times 10^7$ & $1.3 \times 10^7$ & $2.1 \times 10^7$  \\
    Planetary signal [e-/s]        & 5.52 & 1.39 & 0.62 & 0.35  \\
    Photon noise [e-/s]            & 0.459  & 0.388 & 0.358 & 0.365  \\
    - Geometric leakage [e-/s]       & 0.304 & 0.179 & 0.101 & 0.078  \\
    - Null-floor leakage [e-/s]    & 0.019 & 0.017 & 0.013 & 0.017  \\
    - 3-zodi signal [e-/s]           & 0.077 & 0.078 & 0.075 & 0.121  \\
    - Local zodiacal signal [e-/s]   & 0.260 & 0.260 & 0.260 & 0.260  \\
    - Detected thermal [e-/s]        & 0.101 & 0.101 & 0.101 & 0.101  \\
    - Detected stray light [e-/s]    & 0.166 & 0.166 & 0.166 & 0.166  \\
    Dark current [e-/s]            & 0.063 & 0.063 & 0.063 & 0.063  \\
    Detector noise [e-/s]          & 0.063 & 0.063 & 0.063 & 0.063  \\
    Instability noise [e-/s]       & 0.025 & 0.014 & 0.008  & 0.012  \\
    - First order phase term [e-/s]       & 0.021 & 0.008 & 0.002 & 0.001  \\
    - Second order phase-amplitude [e-/s] & 0.014 & 0.012 & 0.007 & 0.012  \\
    Total noise [e-/s]             & 0.460 & 0.388 & 0.358 & 0.365  \\
    Integrated $SNR$ (one rotation) & 16.0 & 4.4 & 2.1 & 1.1\\
    Integration time for $SNR = 5$~[h] & 1.36 & 17.9 & 81.8 & 285\\
    \hline
  \end{tabular}}
\medskip
The final SNRs are computed over a single rotation of 50~000~s and for four targets representative of the target catalogue (see main text for further information).
\end{table}