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This question already has an answer here:

I have a two-column layout, and I want to put a specific section with images to span the whole page width. So I use:

\twocolumn[
...
]

So far, so good. However, when I want to include anything in this block that also includes a square bracket ], then this fails (variety of errors depending on what goes on inside the brackets). How should I go around this?

Example error:

\twocolumn[
  \includegraphics[width=15cm]{abc.jpg}
]

marked as duplicate by Torbjørn T., clemens, egreg, cmhughes, Stefan Kottwitz Apr 16 '13 at 20:23

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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\twocolumn[
 {\includegraphics[width=15cm]{abc.jpg}}
]

(Grouping {} added).

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