origin of packages in aptitude

[Geoff Crompton <geoff.crompton@bjhcontrols.com.au>]

  Hi,

  I know you can use ~O<origin> as a search term in aptitude. Is there a
  way in aptitude of displaying the origin of a package?

  I can do a !~ODebian, but I don't know where those packages that are
  listed (such as my openoffice packages) came from, apart from looking
  at my sources.list.

  Cheers
  Geoff