\begin{table}%t3
\caption{The HRS parameters for the studied sample.}\label{tab:HRS}
%\centering
$$
\begin{tabular}{lr@{$\;\pm\;$}lr@{$\;\pm\;$}lr@{$\;\pm\;$}lr@{$\;\pm\;$}lr@{$\;\pm\;$}lcc}
\hline
\hline
BATSE & \multicolumn{2}{c}{$\eta$} & \multicolumn{2}{c}{$\langle \alpha \rangle$} &
 \multicolumn{2}{c}{$E_0$} & \multicolumn{2}{c}{$\Phi_0$}&\multicolumn{2}{c}{$F_{\rm pk}$}
 & {$HR$} & {$z^1$} \\
Trigger & \multicolumn{2}{c}{} & \multicolumn{2}{c}{} & \multicolumn{2}{c}{[keV]}  &  \multicolumn{2}{c}{[cm$^{-2}$]} &
\multicolumn{2}{c}{[photon/s/cm$^{2}$]} & & \\
 \hline
907 &      2.34    & 0.15&   0.37 &0.08 &   504&75  &   20  &  1  & \hspace*{3mm}4.9&0.3      &     1.87    &    0.40 \\
973a    &     1.45    & 0.21&  $ -$1.01&0.03 &   515&25  &   55  &   11 &     12.4&0.7      &     1.30  &   $ 0.35 $    \\
973b    &      0.84    & 0.1 &  $ -$1.38&0.06 &   544& 58  &   17 &   4  &      6.8& 0.2   &     0.97    &   $ 1.7^3$    \\
999     &      1.9 & 0.1 &  $ -$0.5 &0.1  &   373&35  &   24     & 1  &              20.9&1.5      &     1.81    &   $ 0.67 $    \\
1625    &      2.37    & 0.3 &  $-$0.74&0.02 &   1005&45 &   42   &   7  &      55.3& 1.1     &     2.35    &   $ 1.8 $ \\
1883$^2$    &      2.39    & 0.29&  \multicolumn{2}{c}{$-$0.3--$-$2.0}    &   451&21 & 18 & 1&    8.7&0.8      &     1.23    &   $0.45 $ \\
2083    &      1.78    & 0.04&  $-$0.36 &0.02 &   1010&60 &   65    & 2  &     86.0&1.5    &     0.55    &   $ 0.18$ \\
2156    &      1.55    & 0.15&  $-$0.84 &0.02 &   475&65  &   42  &    6  &      23.1&0.7      &     2.08    &   $0.41$  \\
3257    &      2.8 & 0.2&  0.07  & 0.06    &   344& 22  &   75 &  4  &    3.8&0.4    &     1.65    &   $ 0.38 $    \\
3648a   &      0.64   &  0.03&  $ -$0.61&0.2  &   157&19  &   19   &   1  &    1.5& 0.4    &     0.53    &   $1.11^3$    \\
3648b   &      1.42    & 0.08&  $-$0.36&0.05 &   716&17  &   19     &2  &  8.5&0.4   &     1.28    &   $ 0.38$ \\
3765    &      2.4 & 0.2 &  $-$0.76&0.02 &   381&17  &   64     &8  &  45&2    &     1.86    &   $0.64 $ \\
3891    &      1.8 & 0.18&  $-$0.75&0.06 &   269&13  &   17     & 1  &        29.6 &1.2     &     1.36    &   $ 0.68$ \\
5478    &      1.87    & 0.16&   0.13 &0.13 &   813&32  &   17&  2  &  3.8&0.9    &     1.30 &   $0.53 $ \\
5563    &      2.35    & 0.3 &  $-$0.87  &0.07   &  320&15  &  19&4  &    39 & 2     &    1.35    &   $0.76 $ \\
6581    &      1.62    & 0.2 &  $ -$0.65&0.03 &   762&40  & 20 &  1  &   87.2&1.5     &     2.04    &   $1.16 $ \\
7293    &      2.04    & 0.12&  0.79 &0.09 &   397&51&   38     &4  &  3.7&0.5    &   1.97    &   $ 8.6$
\\
\hline
\multicolumn{13}{l}{$^1$ Lag-estimated.}\\
\multicolumn{13}{l}{$^2$ Strong $\alpha$-evolution.}\\
\multicolumn{13}{l}{$^3$ Secondary pulse; ignored.}
\end{tabular}
$$
\end{table}