**Table 1:** Summary of $\eta$ values derived with the method of direct temperature estimates in the redshift range $2.58 \le z \le 2.74$ .
$\begin{table}\begin{displaymath} \begin{array}{l c c c c} \hline\hline & \... ...90 & 2.16 \pm 0.62 & 2.01 \\ \hline \end{array} \end{displaymath} \end{table}$

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