\begin{table}%t1
\caption{\label{table:matrices}Table of matrices.}
\par
  %\centering
\small
 \begin{tabular}{llll}
 \hline\hline
 Matrix & Size & Eq. & Comment\\
 \hline
 $\bP$  &  $n_{t}\times 3n_p$ & (\ref{eq:pointing}) & pointing matrix\\
 $\bF$   & $n_{t} \times n_b$ & (\ref{idealized_noise}) & baselines to TOD \\
 $\Cw \equiv \langle \bw \bw^{\rm T} \rangle$  & $n_{t} \times n_{t}$ & (\ref{eq:cw}) & white noise cov. \\
 $\bM \equiv \bP^{\rm T}\Cwi\bP$  & $3n_p \times 3n_p$ & (\ref{eq:Mdef}) & $N_{\rm obs}$ matrix \\
 $\bB \equiv \bMi\bP^{\rm T}\Cwi$ & $3n_p \times n_{t}$ & (\ref{eq:Bdef}) & bin TOD to a map \\
 $\bZ \equiv \bI - \bP\bB$ & $n_{t}\times n_{t}$ &
 (\ref{eq:Zdef}) & \\
 $\bD \equiv \bF^{\rm T}\Cwi\bZ\bF$ & $n_b\times n_b$ & (\ref{eq:Dshort}) & \\
 $\bA \equiv \bDi\bF^{\rm T}\Cwi\bZ$ & $n_b\times n_{t}$ & (\ref{eq:Adef}) & solve baselines \\
 $\bR \equiv \left(\bF^{\rm T}\Cwi\bF\right)^{-1}\bF^{\rm T}\Cwi$ & $n_b\times
 n_{t}$ & (\ref{eq:Rdef}) & reference baselines \\
 \hline
 \end{tabular}
\end{table}