\begin{table}%T4
  \caption{\label{tab2}Application of the method to low BH~masses: fit results.}
  \small
  %\centering
\par
  \begin{tabular}{l c c c c c}
    \hline\hline
    \noalign{\smallskip}
     Parameter & \multicolumn{2}{c}{$M_{\rm BH}=10^7~M_\odot$ model} & \multicolumn{3}{c}{$M_{\rm BH}=10^{6.5}~M_\odot$ model}\\
   \noalign{\smallskip}
     & Fit result & Model parameters & Fit result\tablefootmark{A} & Fit result\tablefootmark{B} & Model parameters \\
     \hline
    \noalign{\smallskip}
    $\theta_{\rm LON}\ \ \ [^{\circ}]\ \ \ \ ({\rm line\ of\ nodes\ fit})$ & $0\pm2$  & $0.00$ & $-2 \pm5$ & $-0.5\pm0.7$&$0.00$\\
    $b\ \ \ [\arcsec]\ \ \ \ \ ({\rm line\ of\ nodes\ fit})$                   & $-0.007\pm0.005$&$0.00$ & $-0.02 \pm0.02$ & $-0.001\pm0.002$&$0.00$\\
       \noalign{\smallskip}
    $\log_{10}(M_{\rm BH})\ \ \ [\log_{10}~(M_\odot)]$ & $7.20\pm 0.03$ & $7.00$ & $7.23\pm 0.04$ & $6.82\pm0.08$ &$6.50$\\
    $\log_{10}(M/L)\ \ \ [\log_{10}(M_\odot/L_\odot)]\ \ \ \ $ & $0.00$\tablefootmark{b} & $0.00$ & $0.00$\tablefootmark{b} & $0.00$\tablefootmark{b} &$0.00$\\
    $S_0\ \ \ [\arcsec]$                              & $-0.03\pm 0.02$ &  $0.00$ & $0.00$\tablefootmark{b} & $0.025\pm0.00$\tablefootmark{c}& $0.00$\\
    $V_{\rm sys}\ \ \ [{\rm km~s^{-1}}]$                              & $493\pm 6$ &  $500$ & $500$\tablefootmark{b} & $503\pm4$& $500.0$\\
    $i\ \ \ [^{\circ}]$                                & $35.0$\tablefootmark{b} & $35.0$ & $35.0$\tablefootmark{b} & $35.0$\tablefootmark{b} &$35.0$\\
    $\Delta_{\rm sys}\ \ \ [{\rm km~s^{-1}}]$                             & $0$ & $-$& $0$ & $8$& $-$\\
    \noalign{\smallskip}
     reduced $\chi^2 \ \ \ (\chi^2/{\rm d.o.f.})$ & $0.04\ \ (0.04/1)$ & $-$ & $0.26\ \ (0.26/1)$ & $1.13\ \ (1.13/1)$ &$-$\\
     \noalign{\smallskip}
    $x_{\rm BH}\ \ \ [\arcsec]$                           & $-0.03 \pm 0.02$ & $0.00$ & $0.00 \pm 0.00$\tablefootmark{d} & $0.025 \pm 0.00$\tablefootmark{d} & $0.00$ \\
    $y_{\rm BH}\ \ \ [\arcsec]$                             & $-0.007 \pm 0.005$ & $0.00$& $-0.02 \pm 0.02$ & $-0.001 \pm 0.003$& $0.00$\\
    \hline
  \end{tabular} 
\tablefoot{\tablefoottext{A}{Simulation of the model with $50$~km~s$^{-1}$ velocity bins;}
\tablefoottext{B}{simulation of the model with $10$~km~s$^{-1}$ velocity bins.}
\tablefoottext{b}{Parameter hold fixed;}
\tablefoottext{c}{parameter at the edge of allowed range;}
\tablefoottext{d}{parameter calculated from fixed parameters.}}
\end{table}