\begin{table}%t4
\caption{\label{tab:IMF}The number of observed stars in 4~mass ranges, compared to the expectations according to the \citet{Salpeter1955} and the \citet{Scalo1986} mass functions.}
%\centering
\par
\begin{tabular}{lccc}
\hline\hline \noalign{\smallskip}
Mass range & Observed & Salpeter & Scalo\\ 
\hline
${>}30~M_{\odot}$ & 5 & 4.8 & 2.8\\
$20{-}30~M_{\odot}$& 3 & 7.2 & 4.7\\
$15{-}20~M_{\odot}$& 8 & 10.7 & 8.0\\
$8{-}15~M_{\odot}$& 46 & 47.7 & 42.5\\
\hline
\end{tabular}
\end{table}