\begin{table}%t4
\caption{\label{osn_tab1}Amplitudes, phases, $S/N$ values and S{\sc ig}S{\sc pec} significances for the only significant frequency of 34.704~d$^{-1}$ derived from the OSN $\it uvby$~data set of HD~261387~(V3).}
\small%\centerline
 {
\begin{tabular}{ccrrr}
\hline\hline
\multicolumn{1}{c}{Filter} & \multicolumn{1}{c}{amp} & \multicolumn{1}{c}{Phase} &
\multicolumn{1}{c}{$S/N$} & \multicolumn{1}{c}{sig}\\
  & \multicolumn{1}{c}{[mmag]} & \multicolumn{1}{c}{[rad]} &  & \\
\hline
  $u$    &     3.26  &     3.682  &  4.0 & 8.4 \\
  $v$    &     3.52  &     3.770  &  9.9 & 30.6 \\
  $b$    &     3.04  &     3.707  &  6.5 & 5.8 \\
  $y$    &     2.45  &     3.776  &  3.6 & 7.8 \\
\hline
\end{tabular}}
\medskip
Sigmas of the residuals in millimagnitudes are 12.2~($u$), 5.7~($v$), 7.0~($b$) and 10.7~mmag~($y$).
\end{table}