I use \usepackage{dcolumn} to make the article double columns.

how to add the midline between the two columns for the whole article?

  • 3
    dcolumn is for setting numbers in a table it has no effect on the page layout, you presumably have a class that defaults the twocolumn option on \documentclass – David Carlisle Jun 24 '18 at 20:43

This is unrelated to dcolumn (which is about columns of decimal numbers in tables) but the width of the rule separating the columns of a page may be set by


or whatever width you need.

  • Thx and thx for your clarification. – kinder chen Jun 24 '18 at 20:50

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