**Table 1:** Data on observed fields of M 31.
$\begin{displaymath}\begin{tabular}{rcr@{ ... }rr@{ ... }rrcc} \hline\hline Field... ...quare arcminutes} &1~688~073 &0.35 &29\\ \hline \end{tabular}\end{displaymath}$ ¹⁾ Temperatures are on $T_{\rm mb}$ -scale, where $T_{\rm mb} = 1.15 T_{\rm A}^*$ . ²⁾ Weighted means.

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