$\mu_L$
$\mu_S$
$\mu_Q$
$\sigma_L^2$
$\sigma_S^2$
$\sigma_Q^2$
$\sigma_e^2$
$k$
$\sigma_{LS}$
$\sigma_{LQ}$
$\sigma_{SQ}$
$A$
$\mathbf{\Psi}$