Below is a power spectrum for the starburst galaxy NGC 7552. This plot resulted from a short integration on a 107m baseline. Although it is possible to find intense HI emission after only five minutes of integration, don't be surprised if you cannot see a weak source after a few hour's integration.
![\begin{figure}
\centering
\includegraphics[width=0.3\textwidth,angle=-90]{galaxy1.HIspectrum.ps}
\end{figure}](img122.gif){kind=small}