\begin{table}%t1[t]
\caption{Coefficients to estimate the expected random error in typical
line-strength indices and colors, as a function of the mean signal-to-noise
ratio per \AA, following Eq.~(\ref{equation_error_sn}). Note that these
coefficients are valid for atomic indices when measured in magnitudes (i.e.\ as
if they were molecular indices). For line-strength indices measured in
\AA\ see coefficients in Table 1 in Cardiel et~al.~(\cite{cardiel98}).} 
\label{table_c_coefficients}
%\centering
\par
\begin{tabular}{lc|lc|lc} \hline\hline
Index & $c$ & Index & $c$ & Color & $c$ \\ \hline\noalign{\smallskip}
$\tilde{\rm D}_{4000}$                  &  0.109 &
Fe4531                                  &  0.273 &  
$(u-g)_{\rm AB}$         &  0.0500\\ 
%
H$\delta_{\rm {A}}$                    &  0.217 &
Fe4668                                  &  0.224 &
$(g-r)_{\rm AB}$         &  0.0421\\
%
H$\delta_{\rm {F}}$                    &  0.281 &
H$\beta$                                &  0.276 &
$(g-i)_{\rm AB}$         &  0.0412\\
%
CN$_1$                                  &  0.224 &
Fe5015                                  &  0.234 &
$(g-z)_{\rm AB}$         &  0.0393\\
%
CN$_2$                                  &  0.269 &
Mg$_1$                                  &  0.166 &
$(g-J)_{\rm AB}$         &  0.0368\\
%
Ca4227                                  &  0.400 &
Mg$_2$                                  &  0.193 &
$(g-H)_{\rm AB}$         &  0.0354\\
%
G4300                                   &  0.265 &
Mgb                                     &  0.268 &
$(g-K{\rm s})_{\rm AB}$        &  0.0348\\
%
H$\gamma_{\rm {A}}$                    &  0.204 &
Fe5270                                  &  0.251 &
$(U-B)$                                 &  0.0502\\
%
H$\gamma_{\rm {F}}$                    &  0.274 &
Fe5335                                  &  0.292 &
$(B-V)$                                 &  0.0434\\
%
H$\gamma_{\rm {HR}}$                   &  0.887 &
Fe5406                                  &  0.314 &
$(V-R)$                                 &  0.0373\\
%
H$\gamma_{{\rm VA,125}}$   &  0.260 &
Fe5709                                  &  0.291 &
$(V-I)$                                 &  0.0367\\
%
H$\gamma_{{\rm VA,200}}$   &  0.233 &
Fe5782                                  &  0.333 &
$(V-J)$                                 &  0.0391\\
%
H$\gamma_{{\rm VA,275}}$   &  0.218 &
Na5895                                  &  0.271 &
$(V-K)$                                 &  0.0352\\
%
Fe4383                                  &  0.280 &
TiO$_1$                                 &  0.182 &
$(R-I)$                                 &  0.0285\\
%
Ca4455                                  &  0.340 &
TiO$_2$                                 &  0.157 &
$(J-H)$                                 &  0.0309\\
%
                                        &        &
                                        &        &
$(H-K)$                                 &  0.0257\\ \hline
\end{tabular}
%\vspace*{5mm}
\end{table}