[Tex/LaTex] How to have both onecolumn and twocolumn in the same page in ACM SIGPLAN paper

acmtwo-column

I need to have in the same page both onecolumn and twocolumn. As default, a page in ACM SIGPLAN latex is twocolumn. But I have a picture that need to be located in onecolumn. When I use :
\onecolumn
here picture
\twocolumn
…
My image will be put in a seprate page (alone). But I don't put it in a seprate page. I wonder if I have in the same page both onecolumn and twocolumn, i.e have that image at the top of the page in onecolumn, and the rest of that page contains ordinary text in two columnn.

Is it possible?
SIGPLAN latex: http://drupal.sigplan.org/sites/default/files/sigplanconf-guide.pdf

Best Answer

I think the trick might be to use the \begin{figure*}...\end{figure*} environment. That should give you a figure that spans the whole page width, while allowing the rest of that page to be in two columns. In contrast, the \begin{figure}...\end{figure} environment gives you a figure that spans only one column.

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