262Where an infringement has been committed by several undertakings, it is appropriate, when setting the amount of the fines, to consider the relative gravity of the participation of each of them (Joined Cases 40/73 to 48/73, 50/73, 54/73 to 56/73, 111/73, 113/73 and 114/73 Suiker Unie and Others v Commission [1975] ECR 1663, paragraph 623, and Aalborg Portland and Others v Commission, cited in paragraph 158 above, paragraph 92), which implies in particular that the roles played by each of them in the infringement for the duration of their participation in it should be established (Commission v Anic Partecipazioni, cited in paragraph 30 above, paragraph 150, and Case T-6/89 Enichem Anic v Commission [1991] ECR II-1623, paragraph 264).
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