\begin{table}%t4
    \caption{\label{param}Free and fixed parameters for the mass model of the
             Galaxy and experimental constraints. One observes that
             there are 5 free parameters and 8 constraints. Mass densities
             are in GeV cm$^{-3}$ or in $M_\odot$~pc$^{-3}$, where
             $1~M_\odot$~cm$^{-3} \equiv 37.97$~GeV~cm$^{-3}$.}
\par
             %\centering
\par
    \begin{tabular}{ll||ccc}\hline\hline 
    \multicolumn{5}{c}{Free parameters} \\\hline 
      Component & Parameter& Symbol & Value & Unit\\   
      Halo&Local DM density& $\rho_{\odot, {\rm DM}}$& -- & GeV/cm$^{-3}$ \\  
      Halo&Scale Parameter& $a$& -- & kpc \\  
      Halo&eccentricity& $\epsilon_{z}$& -- & kpc \\ 
      Disc& Density at GC& $\rho_{\rm d}$ & -- & GeV cm$^{-3}$ \\  
      Disc& scale length&$r_{\rm d}$& -- & kpc \\ \hline  
      \multicolumn{5}{c}{Fixed parameters} \\\hline 
      Disc& scale height& $z_{\rm d}$& 320 & pc \\  
      Bulge& Density at GC& $\rho_{\rm b}$& 360& GeV cm$^{-3}$ \\  
      Bulge& Eccentricity & $q_{\rm b}$ & 0.61 & \\  
      Bulge& Scale   &      $r_{\rm t}$ & 0.6 & kpc \\  
      Bulge& Scale   &      $r_{\rm{0,b}}$ & 0.7 & kpc \\  
      Bulge& Slope   & $\gamma_{\rm b}$ & 1.6  & \\  
      Bulge& Slope   & $ \beta_{\rm b}$ & 1.6  & \\\hline  
      \multicolumn{5}{c}{Constraints} \\\hline 
      All & Mass inside 60 kpc & $M_{R < 60~{\rm kpc}}$ & 4.0 $\pm$ 0.7 & 10$^{{\rm 11}}$ $M_\odot$ \\ 
      Local & Rotation speed Sun & $v_\odot$ & 244$\pm$ 10 & km s$^{-1}$ \\  
      Local & Distance Sun-GC & $r_\odot$ &  8.33 $\pm$ 0.35 & kpc \\  
      Local & Total Surface Density & $\Sigma_{|z|<{\rm 1.1}}$ & 71 $\pm$ 6 & $M_\odot$ pc$^{-2}$ \\  
      Local & Visible Surface Density & $\Sigma_{\rm vis}$& 48 $\pm$ 9 & $M_\odot$ pc$^{-2}$ \\  
      Local & Mass Density &$\rho_{\rm tot}$& 0.102 $\pm$ 0.01 & $M_\odot$ pc$^{-3}$ \\  
      Local & Oort Constants & $A-B$ & 29.45 $\pm$ 0.15 & km s$^{-2}$ kpc$^{-1}$ \\ 
      Local & Slope of rotation curve & $\partial$ ln($v_\odot$)/$\partial$ ln($r$) & --0.006 $\pm$ 0.016 & \\\hline
    \end{tabular}
\par
\end{table}