\documentstyle[aj_pt4]{article}
\pagestyle{empty}
\begin{document}
\tablenum{3}
\begin{deluxetable}{rccc}
\tabcolsep=7pt
\tablewidth{18pc}
\tablecaption{Observations of photoelectric standards in NGC 4833}
\tablehead{\colhead{$V$ range}&\colhead{$\sigma_B$}&\colhead{$\sigma_V$}&\colhead{$\sigma_I$}}
\startdata
     $ <14$ &     0$^m.$003 & 0$^m.$002 & 0$^m.$002\\
  $14<V<16$ &     0.004&  0.003&  0.003\\
  $16<V<18$ &     0.008&  0.007&  0.007\\
  $18<V<20$ &     0.013&  0.013&  0.013\\
  $20<V<22$ &     0.022&  0.017&  0.018\\
  $22<V<24$ &     0.060&  0.042&  0.034\\
\enddata
\end{deluxetable}
\end{document}
