Graph spanning over two columns

[Sébastien PIERRE]

Hi!

I'm currently writing a report (with the standard 'report' template) and
have troubles spanning both text and graphics over two columns, as my
report is configured for two-columns.

For example, I'd like the abstract of my report span over two columns, and
some graphics take the full horizontal space.
I tried to use @OneCol, but it doesn't work, and @FullWidth is not
available in the report template. What could I do?

Thanks,
Sebastien