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Setting the column gap in a twocolumn document

How can I change the distance of two columns in a two-column document?

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Here is the internal definition of \twocolumn. In this definition you can see all length which are use.

\def \twocolumn {%
  \clearpage
  \global\columnwidth\textwidth
  \global\advance\columnwidth-\columnsep
  \global\divide\columnwidth\tw@
  \global\hsize\columnwidth
  \global\linewidth\columnwidth
  \global\@twocolumntrue
  \global\@firstcolumntrue
  \col@number \tw@
  \@ifnextchar [\@topnewpage\@floatplacement
}

Taken from latex.ltx

You are looking for \columnsep.

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