**Table 3:** Mean LSR-velocities^a ( $V_{\rm mean}$ ) for the identified maser features.
$\begin{displaymath}\begin{tabular}{lcrrrr} \hline\hline \smash{\lower2.ex\hbox{F... ... $-$91.2 & $-$91.3 & $-$91.2 & $-$91.3 \\ \hline \end{tabular}\end{displaymath}$ ^a Errors are typically less than 0.03 km s^-1.