\begin{table}%t2
\caption{Internal errors due to changes in stellar parameters for three stars with different temperatures. The total error in the last column includes the observational errors (0.024~dex for Fe~I and 0.037~dex for~Fe~II).}
\label{errors}
%\centering
\small
\begin{tabular}{lllll}
\hline\hline
%&&&& \\[-8pt]
Ion & $\Delta$ $T_{\rm eff}$ & $\Delta$ $\log~g$ & $\Delta$ $v_{t}$ & $\sqrt{\Sigma x^{2}}$ \\
 & +80 K & $+$0.2 dex & $+$0.2 km~s$^{-1}$ &\\
 \hline
HD~156681 & ($T$ = 4170 K) &&&\\
Fe I & --0.01 & +0.07 & --0.07  & 0.10\\
Fe II & --0.15 & +0.16 & --0.03  & 0.22\\
HD~214868 &($T$ = 4445 K) &&&\\
Fe I & +0.01 & +0.07 & --0.06  & 0.10\\
Fe II & --0.12 & +0.18 & --0.04  & 0.22\\
HD~165634& ($T$ = 4980 K) &&&\\
Fe I & +0.06 & +0.02 & --0.06 & 0.09\\
Fe II & --0.06 & +0.10 & --0.07 & 0.14\\ 
\hline
\end{tabular}
\end{table}