\begin{table}%t1
      \caption{Wavelength ranges of the positive -- and negative bands of the
      indices, with the associated errors.}\label{indexranges}
         %\centering
\par
         \begin{tabular}{llll}
            \hline
            \hline \\[-3mm] 
	     Index &  $+$ Range [\AA] &  $-$ Range [\AA] & ${\rm \sigma_{index}}$ \\
            \hline
 Continuum index & 6320--6520 & 4500--4800 &  0.23 \\
                 & 6600--6700 &  \\
 4000 \AA\ break & 4010--4060 & 3900--3950 &  0.03  \\
 H+K(Ca)         & 3905--3920 & 3923--3942 &  0.05  \\
                 & 3942.5--3956 &  \\
 H${\delta}$    & 4055--4072 & 4073--4095.25 &  0.04  \\
                 & 4120--4145 & 4106.5--4119  \\
 Fe4531          & 4498--4517 & 4521--4559.5  &  0.04 \\
                 & 4560--4573 &  \\
 Mg$_b$          & 5153--5161.5 & 5162--5193.5 & 0.05  \\
                 & 5194--5203.5 &  \\
            \hline
         \end{tabular}
   \end{table}