\begin{table}%t2
\caption{Index definition.}             
\label{ind}      
%\centering
\small                          
\begin{tabular}{lccc}      
\hline\hline                
Index & Blue Pseudocontinuum & Feature & Red Pseudocontinuum \\   
(1) & (2) & (3) & (4) \\ 
\hline                       
CN$_{1}$	&      4081.375 4118.875 &   4143.375 4178.375 &   4245.375 4285.375   \\
CN$_{2}$	&      4085.125 4097.625 &   4143.375 4178.375 &   4245.375 4285.375   \\
Ca4227		&      4212.250 4221.000 &   4223.500 4236.000 &   4242.250 4252.250   \\
G4300		&      4267.625 4283.875 &   4282.625 4317.625 &   4320.125 4336.375   \\
Fe4383		&      4360.375 4371.625 &   4370.375 4421.625 &   4444.125 4456.625   \\
H$_{-}$beta	&      4827.875 4847.875 &   4847.875 4876.625 &   4876.625 4891.625   \\
Mg$_{1}$	&      4895.125 4957.625 &   5069.125 5134.125 &   5301.125 5366.125   \\
Mg$_2$		&      4895.125 4957.625 &   5154.125 5196.625 &   5301.125 5366.125   \\
Mgb		&      5142.625 5161.375 &   5160.125 5192.625 &   5191.375 5206.375   \\
Fe5270		&      5233.150 5248.150 &   5245.650 5285.650 &   5285.650 5318.150   \\
Fe5335		&      5304.625 5315.875 &   5312.125 5352.125 &   5353.375 5363.375   \\
Fe5406		&      5376.250 5387.500 &   5387.500 5415.000 &   5415.000 5425.000   \\
NaD		&      5862.375 5877.375 &   5878.625 5911.125 &   5923.875 5949.875   \\
Al3953		&      3937.600 3967.400 &   3921.300 3935.500 &   3969.500 3987.000   \\
\hline                                  
\end{tabular}
\end{table}