110Secondly, under the case-law it is indeed the case that, where an infringement has been committed by several undertakings, the relative gravity of the participation of each undertaking must be examined (see, to that effect, 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). However, in paragraph 323 of the contested judgment, the Court of First Instance found that the Commission had correctly established the role played by Hercules in the infringement and that the Commission had indicated in the Polypropylene Decision that it had taken account of that role when determining the amount of the fine. The Court of First Instance cannot therefore be held to have committed an error of law in that respect.
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