\begin{table}%t1
%\centering
\par
\caption{A comparison of previously known shells (Heiles 1979) 
         and our identifications. The first column gives the names
         of the structures, the second one gives dimensions as
         published by Heiles, the third column gives our dimensions
         ($\Delta l$, $\Delta b$, $\Delta v$).
         \label{tabheilcomp}}
\begin{tabular}{lrr}
\hline\hline
Name & Heiles & this paper \\
~ & ${\rm deg}^2 \ {\rm km~s^{-1}}$ 
  & ${\rm deg}^2 \ {\rm km~s^{-1}}$  \\
\hline
GS090+02-115 & $4\times 4\times 16$ &
               $3\times 4\times 12$ \\
GS091-04-69 & $9\times 10\times 28$ &
              $3\times 5\times 33$ \\
GS091+02-101 & $4\times 3\times 12$ &
               $4\times 4\times 33$ \\
GS108-04-23 & $5\times 11\times 24$ &
              $7\times 14\times 20$ \\
GS128+01-105 & $7\times 6\times 4$ &
               $11\times 5\times 16$ \\
GS148-01+15 & $4\times 4\times 4$ &
              $3\times 5\times 10$ \\
GS152-04-41 & $4\times 4\times 12$ &
              $11\times 9\times 12$ \\
\hline
GS095+04-113 & $10\times 5\times 20$ &
               $10\times 6\times 21$ \\
GS139-03-69 & $18\times 10\times 28$ &
              $13\times 6\times 22$ \\
\hline
\end{tabular}
\end{table}