\begin{table}%t4
\caption{Mean values and errors for the principal and derived parameters including $\alpha$~variation.}
\label{tablacmb}
%{1.1}
%\centering
\small
\begin{tabular}{cc}
\hline \hline
  Parameter & Mean value and $1\sigma$ error \\
\hline
%& \\[-12pt]%[-8pt]
$\Omega_{\rm B} h^2$ & $\rm 0.0215_{-0.0009}^{+0.0009}$ \\
$\Omega_{\rm CDM} h^2$ & $\rm 0.102_{-0.006}^{+0.006}$ 
\\
$\Theta$ & $\rm 1.021_{-0.017}^{+0.017}$ \\
$\tau$ & $\rm 0.092_{-0.014}^{+0.014}$ 
\\
$\Delta \alpha / \alpha_0$ & $\rm -0.015_{-0.012}^{+0.012}$ \\
$n_{\rm s}$ & $\rm 0.965_{-0.016}^{+0.016}$ 
\\
$A_{\rm s}$ & $\rm 3.039_{-0.065}^{+0.064}$ \\
$H_0$ &  $\rm 67.7_{-4.6}^{+4.7}$ 
\\
\hline
\end{tabular}
\end{table}