\begin{table}%t3 \caption{\label{condini}Initial conditions.} %%\centerline { \begin{tabular}{cccc} \hline\hline Component & radius & Mass & Mass fraction \\ & [kpc] & [$M_\odot$]& [ \%] \\ \hline Bulge & 0.5 & 4.e10 & 13.3 \\ Disk & 6.5 & 9.e10 & 30. \\ Halo$^*$ & 15. & 15.e10 & 50. \\ Gas & 8. & 2.e10 & 6.6 \\ Companion & 2.5 & 7.e10 & 23.3 \\ \hline \end{tabular}} \smallskip \par $^*$ Halo mass inside 22~kpc radius.\\ The mass fractions are normalized to the total mass of NGC~1961, $3\times 10^{11}~M_\odot$ inside 22~kpc. \end{table}