\begin{table}%t2
%\centering
\par
  \caption{Parameters of the jets.}  \label{tab1}
\small  \begin{tabular}{llll}
  \hline
  \hline\noalign{\smallskip}
Parameter & I & II & III \\
  \hline\noalign{\smallskip}
Jet power (erg~s$^{-1}$)& $3.0\times 10^{34}$ & $10^{36}$& $3.0\times 10^{37}$\\
Jet init. pressure (erg~cm$^{-3}$)& $9.1$ & $68$& $6.2\times 10^4$\\
Jet init. density (g~cm$^{-3}$)& $2.2\times 10^{-16}$ & $5.9\times 10^{-16}$& $1.8\times 10^{-14}$\\
Jet init. temperature (K)
&$7.4\times 10^{8}$&$2.1 \times 10^{9}$&$6.2 \times 10^{10}$\\
Jet init. speed (cm~s$^{-1}$) & $1.3\times 10^{10}$ & $2.2\times 10^{10}$ & $2.2\times 10^{10}$\\
Jet init. Mach number &47.02&51.05&9.35\\
\hline
  \end{tabular}
\end{table}