I have a latex document that is part of an automated system. So I cannot use fixed widths for the table as the inputs are uncertain.
\begin{tabular}[t]{|l|@{\hfill}r@{ }|c|@{ }l|}
\textbf{\langComponent} & \multicolumn{3}{c}{
\textbf{\shortstack{\leftresultsheader}}
}
\DTLforeach{resultstableA}{\colA=componentA,\colB=amountfracA,\colC=pmsymbolA,\colD=uncertA}{\\{\colA}&{\colB}&{\colC}&{\colD}}
\DTLforeach{resultstableB}{\colE=componentB,\colF=amountfracB,\colG=pmsymbolB,\colH=uncertB}{\\{\colE}&{\colF}&{\colG}&{\colH}}
\end{tabular}
How can I have the last 3 columns (rcl, which display as a result, a plusminus symbol, and an uncertainty) be all centrally aligned as a group underneath the multicoumn header that spans those 3 columns?