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Usually the variety taken as a reference is the one from either the capital or largest/most important cities, unless there is a different kind of explanation (like the one for General American).
So I'm not aware of how things are really in Brazil, but my guess would be that the 'reference' in the media (that is, for the news and most shows) should likely be the educated register of the variety spoken in the Rio-São Paulo area. But as I said, I don't know.
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