\begin{table}%t1
\caption {\label{table:no1}Results obtained from the cosmographic fit of the SNeIa using both the redshift variables~$z$ and~$y$.} % title of Table
%\centering
 % used for centering table
\begin{tabular}{c c c c} % centered columns (4 columns)
\hline\hline % inserts double horizontal lines
\noalign{\smallskip}
Parameter & Value $z$-redshift & Parameter & Value $y$-redshift \\ % table heading
\hline % inserts single horizontal line
$a$ & 4324 $\pm$ 176 & $a$ & 4291.8 $\pm$ 72.9  \\ % inserting body of the table
$b$ & 0.6967 $\pm$ 0.2443 & $b$ & 1.79 $\pm$ 0.015 \\
$c$ & --0.2763 $\pm$ 0.4273 & $c$ & 0.80 $\pm$ 0.029 \\
$d$ & 0.2507 $\pm$ 0.2111 & $d$ & 0.38 $\pm$ 0.031 \\
\hline 
\end{tabular}
\end{table}