\begin{table}%tA.2
\caption{\label{t:sensitivitym15}Sensitivities of abundance ratios to variations in the atmospheric parameters and to errors in the equivalent widths, and errors in abundances for
stars in M~54 observed with GIRAFFE.}
%\centering
\par
\begin{tabular}{lrrrrrrrr}
\hline \hline \noalign{\smallskip}
Element     & Average  & $T_{\rm eff}$ & $\log g$ & [A/H]   & $v_t$    & $EW$s     & Total   & Total      \\
            & n. lines &      (K)      &  (dex)   & (dex)   &km~s$^{-1}$& (dex)   &Internal & Systematic \\
\hline        
Variation&             &  50           &   0.20   &  0.10   &  0.10    &         &         &            \\
Internal &             &   5           &   0.04   &  0.05   &  0.07    & 0.077   &         &            \\
Systematic&            &  38           &   0.06   &  0.04   &  0.01    &         &         &            \\
\hline
$[$Fe/H$]${\sc  i}& 38 &   +0.055      &   +0.006 &$-$0.004 & $-$0.031 & +0.012  &0.026    &0.042      \\
$[$Fe/H$]${\sc ii}&  3 & $-$0.044      &   +0.092 &  +0.027 & $-$0.008 & +0.044  &0.050    &0.047      \\
$[$O/Fe$]${\sc  i}&  1 & $-$0.041      &   +0.074 &  +0.036 &   +0.029 & +0.077  &0.083    &0.055      \\
$[$Na/Fe$]${\sc i}&  3 & $-$0.009      & $-$0.051 &$-$0.029 &   +0.022 & +0.044  &0.050    &0.041      \\
$[$Mg/Fe$]${\sc i}&  2 & $-$0.014      & $-$0.015 &$-$0.005 &   +0.017 & +0.054  &0.056    &0.024      \\
$[$Si/Fe$]${\sc i}&  7 & $-$0.059      &   +0.024 &  +0.012 &   +0.025 & +0.029  &0.035    &0.047      \\
$[$Ca/Fe$]${\sc i}&  7 &   +0.017      & $-$0.029 &$-$0.013 & $-$0.013 & +0.029  &0.032    &0.020      \\
$[$Sc/Fe$]${\sc ii}& 6 & $-$0.061      &   +0.068 &  +0.031 &   +0.010 & +0.031  &0.038    &0.052      \\
$[$Ti/Fe$]${\sc i}&  5 &   +0.039      & $-$0.016 &$-$0.014 &   +0.008 & +0.034  &0.036    &0.034      \\
$[$V/Fe$]${\sc i} &  6 &   +0.056      & $-$0.015 &$-$0.015 &   +0.013 & +0.031  &0.034    &0.047      \\
$[$Cr/Fe$]${\sc i}&  4 &   +0.020      & $-$0.018 &$-$0.009 &   +0.024 & +0.039  &0.042    &0.020      \\
$[$Co/Fe$]${\sc i}&  1 &   +0.004      &   +0.009 &  +0.007 &   +0.025 & +0.077  &0.079    &0.010      \\
$[$Ni/Fe$]${\sc i}&  8 & $-$0.014      &   +0.014 &  +0.009 &   +0.021 & +0.027  &0.031    &0.013      \\
\hline
\end{tabular}
\end{table}