I am stacking one header by using this macro: \newcommand*{\textstackrel}[2]{\ensuremath{\stackrel{\hbox{#1}}{\hbox{#2}}}}. This makes the other single line headers bottom aligned, which looks bad.

So I tried a few multirow tricks I know to no avail, e.g.: assign column name/.code={\multicolumn{1}{c}{\multirow{2}{*}{#1}}}

Most of the time I ran into this error message:

! siunitx error: "duplicate-exponent-token"
! Duplicate exponent marker token '\token_to_str:N d' in input.

How do I do this correctly?

PS: MWE will follow when I have (more) time and if there is no answer before that.

  • I think you do need to provide some more information: Why do you get siunitx errors if you're not using the S column type?
    – Jake
    Dec 14, 2012 at 7:06
  • The column types for the actual cells are of course S. Unfortunately I can not reproduce the error I had. On the positive side, I will post a solution for the original problem in a few :)
    – stefanct
    Dec 15, 2012 at 14:06

1 Answer 1


While preparing the MWE I have found a possible solution. Feel free to improve it or post another one.



size        min         max         avg         med
1           2e-03       3e-03       2.5e-03     2.4e-03
10          2.02e-03    3.02e-03    2.72e-03    2.32e-03
123456789   2.02        123.72e9    2.72e9      2.32e-03

    begin table=\begin{longtable},
    end table=\end{longtable},
    table-format = 3.2e+3,
    exponent-product = \cdot,

    string type,
    multicolumn names,
    assign column name/.code={%
        \pgfkeyssetvalue{/pgfplots/table/column name}{\multicolumn{1}{c}{\multirow{2}{*}{#1}} }%
    columns/size/.style ={column name={\shortstack{Instance\\Size}}, column type={S[scientific-notation=false,table-format=9]}, int detect},
    columns/min/.style ={column name=Minimum,   column type=S},
    columns/avg/.style ={column name=Average,   column type=S},
    columns/med/.style ={column name=Median,    column type=S},
    columns/max/.style ={column name=Maximum,   column type=S},
    every head row/.style={before row=\toprule, after row=\\\midrule\endhead},
    every last row/.style={after row=\bottomrule},


The important bits are:

  • to use \pgfkeyssetvalue in assign column name/.code, and
  • the additional \\ line break in after row in the every head row style.

  • 1
    Looks good! I would probably use \shortstack{Instance\\Size} instead of the \textstackrel macro.
    – Jake
    Dec 15, 2012 at 14:46

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