\begin{table}%t3
\caption{\label{freqsdisc}Frequency, period, amplitude, phase and signal-to-noise ratio of the
pulsations detected in the amplitude spectrum of PG~1657+416 in the 
different
runs. Phase is relative to the first data point of each light curve.  The
S/N values are after prewhitening.}
\small%\centering
\par
\begin{tabular}{@{}c@{ }c@{ }cc@{}c@{ }c@{ }c@{ }c}
\hline\hline
Run& {\it FWHM}     & & Freq.     & Period &  Ampl.  & Phase  & $S/N$\\
   & ($\mu$Hz)& & ($\mu$Hz) &  (s)   &  (mma)  & (rad)  &   \\
\hline
Discovery & 520 & $f_1$ & 6857 & 145  &    2.52 &  2.11857  &   4.37\\
          &     & $f_2$ & 7880 & 126 &    2.52 &  3.05380  &   3.08\\
\hline
Confirmation& 303 & $f_1$ &  6969 & 143 & 1.78 &   --0.16974   &   4.66\\
          &     & $f_3$ &  7500 & 133 &  3.71 &    1.92694   &   4.62\\
\hline
IAC80 2005& 3   &$f_1$ & 6891.94 &145  &    1.61  &    0.84404   &   4.61 \\
          &     &$f_4$ & 7731.37 &129  &    1.36  &   --3.40146   &   3.52 \\
          &     &$f_5$ & 7150.18 &139  &    1.23  &   --0.13925   &   3.68 \\
          &     &$f_3$ & 7568.54 &132  &    1.17  &   --0.51874   &   3.16 \\
\hline
NOT 2005  & 4.8 & $f_3$ & 7567.74 &132  &    2.69  &   0.74745  &    15.15\\
          &     & $f_4$ & 7730.67 &129  &    0.96  &   0.23507  &    5.97\\
          &     & $f_2$ & 7831.95 &139  &    1.17  &   1.76060  &    6.95\\
\hline
\par
IAC80+NOT & 2.95 &$f_1$ & 6891.88 & 145 &     1.34  &    0.90497   &    4.51\\
     2005 &      &$f_3$ & 7568.66 & 132 &     1.44  &   --0.67775   &    4.65\\
          &     &$f_4$ & 7731.21  & 129 &    1.28  &    3.06778   &    3.95\\
          &     &$f_5$ & 7150.10  & 139 &   1.01  &   --0.04592   &    3.63\\
\hline
\end{tabular}
\end{table}