\begin{table}%t2
\caption{\label{SystemsTable}Individual high-velocity metal-lines systems in GRB 021004.}
%\centering
\par
\begin{tabular}{lccccc}
\hline\hline \noalign{\smallskip}
 Line ID                  & C2      &    C1   &    D     &     E2   &    E1  \\
  \hline 
Si III $\lambda$1, 206     &    y \tablefootmark{a}  &    y    &    y     &     y    &    y   \\
H I Ly$\alpha$ $\lambda$1, 216 &   y &    y    &    y     &     y    &    y   \\
N V $\lambda$1, 238--1, 242  &    y    &  $-$    &   $-$    &   $-$    &    y   \\
Si II $\lambda$1, 260--1, 264&  $-$    &    y    &    ?     &   $-$    &    y   \\
C II   $\lambda$1, 334     &    y    &    y    &   $-$    &   $-$    &   $-$  \\
Si IV $\lambda$1, 394--1, 403&    ?    &    ?    &    ?     &     ?    &    y   \\
C IV $\lambda$1, 548--1, 551 &    y    &    y    &    y     &     y    &    y   \\
Al II $\lambda$1, 671      &   $-$   &    y    &   $-$    &     y    &    y   \\
Al III $\lambda$1, 855--1, 863&  $-$   &  $-$    &   $-$    &   $-$    &    y   \\
Fe II $\lambda$2, 344--2, 382 &  $-$   &  $-$    &   $-$    &   $-$    &    y   \\
  $z$        &2.29671 & 2.29935 &  2.3216  &  2.3275  & 2.32891\\
  $v$ (km~s$^{-1}$)\tablefootmark{b} & $-$3050\tablefootmark{c} & $-$2810\tablefootmark{d} & $-$795\tablefootmark{e} & $-$262\tablefootmark{f} & $-$134\tablefootmark{g}  \\
\noalign{
\smallskip} 
\hline
\end{tabular}
\tablefoot{\tablefoottext{a}{y = yes; $-$ = no; ? = doubtful, low significance due to low {\it S/N} in the S IV region.}
\tablefoottext{b}{Relative to the systemic velocity of the host galaxy at $z = 2.3304$, which we set as zero.}
\tablefoottext{c}{Embedded as C1 in the wide C complex (2730--3250~km~s$^{-1}$).}
\tablefoottext{d}{Two subcomponents at $-$2837 and $-$2803~km~s$^{-1}$ (low ionization) and $-$2860 and $-$2810~km~s$^{-1}$ (high ionization).}
\tablefoottext{e}{Wide complex spanning 585--1005~km~s$^{-1}$.}
\tablefoottext{f}{Embedded as E1 in the wide E complex (40--390~km~s$^{-1}$).}
\tablefoottext{g}{Two subcomponents at $-$150 and $-$114~km~s$^{-1}$.}}
\end{table}