\begin{table}%t1
\caption{Grisms used for spectroscopy.} \label{grisms}
\par
%\centering
\par
\begin{tabular}{lcr}
\hline  \hline
Grism& Resolution &\hbox{\ $\lambda$\ \ } \\
\hline 
grism \#2& ~~ 0.35~nm/pixel ~ & ~ 390 to 980 nm \\
grism \#3& ~~ 0.29~nm/pixel ~ & ~ 390 to 850 nm \\
grism \#6& ~~ 0.15~nm/pixel ~ & ~ 500 to 880 nm \\
\hline
\end{tabular}
\par
\end{table}