71The Guidelines are an instrument designed to clarify, in compliance with superior rules of law, the criteria which the Commission intends to apply when exercising the discretion conferred on it by Article 23(2) of Regulation No 1/2003 for the purpose of setting fines. The Guidelines do not constitute the legal basis of a decision imposing fines, which is based on Regulation No 1/2003, but they determine, generally and abstractly, the method which the Commission has bound itself to use in assessing the fines imposed by that decision and, consequently, ensure legal certainty on the part of the undertakings (Dansk Rørindustri and Others v Commission, paragraph 69 above, paragraphs 209 to 213, and Joined Cases T-259/02 to T-264/02 and T-271/02 Raiffeisen Zentralbank Österreich and Others v Commission [2006] ECR II-5169, paragraphs 219 and 223).
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