celine said:
That datas is provided by Nielsen, not GFK.
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i know...but as we don't have any HW datas for the last 4 weeks from gfk it's the the only chart we have available right now.
besides this there's no way GFK charts are "more official" than Nielsen charts: they're both made by professionals that get paid for their work (and actually for the records, Nielsen Italia is way bigger than GFK Italia: 70M Euros vs 16M Euros operating revenue last year)