\begin{table}%tD.2
\caption{\label{tab:final_covariance_matrix}Final covariance matrix of the uncertainties affecting (1)~the {\em differences} between the tertiary MegaCam magnitudes and the MegaCam magnitudes of \bdtruc\ and (2)~the Landolt magnitudes of~\bdtruc.}
$$
{\mathbf V}_{\rm final} = 10^{-6} \times \left(\begin{array}{lllllllll}
21.2013 &   6.7600 &   6.7600 &    6.7600 &  -7.8753 &  -7.8753 &  -6.7600 &  -6.7600 &  -6.7600 \\         &  34.0033 &   6.7600 &    6.7600 &  -6.7600 &  -6.7600 &  -6.7600 &  -7.7698 &  -6.7600 \\         &          &  50.5137 &    8.4173 &  -6.7600 &  -6.7600 &  -6.7600 &  -6.7600 &  -8.4500 \\         &          &          &  345.0753 &  -6.7600 & -6.7600 &  -6.7600 &  -6.7600 &  -8.4500 \\ 
        &          &          &           &  13.4200 &   9.0100 &   6.7600 &   6.7600 &   6.7600 \\         &          &          &           &          &   9.0100 &   6.7600 &   6.7600 &   6.7600 \\         &          &          &           &          &          &   6.7600 &   6.7600 &   6.7600 \\         &          &          &           &          &          &          &   7.9700 &   6.7600 \\         &          &          &           &          &          &          &          &   8.4500 \\ 
\end{array}\right)
  \ \ \ \ \ \ \ \ \ 
  \begin{array}{l}
    \gme - g_{\rm ref} \\
    \rme - r_{\rm ref} \\
    \ime - i_{\rm ref} \\
    \zme - z_{\rm ref} \\
    U_{\rm ref} \\
    B_{\rm ref} \\
    V_{\rm ref} \\
    R_{\rm ref} \\
    I_{\rm ref} \\
  \end{array}
$$
\end{table}