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\begin{document}
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\begin{planotable}{llll}
\tablenum{11}
\tablewidth{5.0in}
\tablecaption{MAGNITUDE SCALE ZERO POINTS\tablenotemark{a}}
\tablehead{
%------------------- 1st row ----------------------
\colhead{Band} &
\colhead{Reference $\lambda$}  &
\colhead{Zero pt (Jy)}  &
\colhead{Zero pt (Jy)}  \\
%---------------- 2nd row ------------------------
\colhead{ } &
\colhead{($\mu$m)}  &
\colhead{(Vega)}  &
\colhead{($\alpha=1$)}  \\
}
\startdata
U & 0.36 & 1317 & 1779\\
B & 0.44 & 4333 & 4047\\
V & 0.54 & 3647 & 3536 \\
R & 0.70 & 2791 & 2869 \\
I & 0.90 & 1871 & 2339 \\
J & 1.25 & 1567 & 1657 \\
H & 1.65 & 1016 & 1053 \\
K & 2.20 &  687 & 710 \\
N34& 3.40& 325 & 321\\
L'& 3.80 & 256 & 270\\
M & 4.8  & 161 & 167\\
N & 10.1 & 39 & 38\\
Q & 20.25 &  9.8 & 11\\
\tablenotetext{a}{The zero points correspond
to a system in which the magnitude of Vega
is exactly zero. Values are given for an object
with the same spectrum as Vega and for an object
with a flat energy distribution (power law
spectrum $F_\nu\sim\nu^{-\alpha}$ of slope unity).
}
\end{planotable}
\end{document}