\begin{table}%t2
\caption{\label{tab2}The amounts (in per cents) of comets from various regions of their origin (Sect.~2.2), which were ejected into the interstellar space during the first $2$~Gyr.}
%\centering
\small
\begin{tabular}{crrrrrrr}
\hline\hline\noalign{\smallskip}
model & TN & JR & SR & UR & NR & KBR & PPD \\
\hline
A & 10~038 & 13.8 & 18.0 & 15.9 & 14.4 & 4.4 & 66.4 \\
B &  7220 &  9.9 & 13.6 & 16.8 & 14.3 & 6.1 & 60.6 \\
C &  4829 &  2.1 &  9.9 & 16.1 & 13.0 & 8.8 & 49.8 \\
D &  2284 & 18.8 & 16.2 & 15.4 &  8.0 & 5.6 & 64.0 \\
\hline
\end{tabular}
\end{table}