81At the outset, it should be borne in mind that it is not for the Court, when ruling on questions of law in the context of an appeal, to substitute, on grounds of fairness, its own assessment for that of the General Court exercising its unlimited jurisdiction to rule on the amount of fines imposed on undertakings for infringements of EU law (see, inter alia, judgment of 22 November 2012 in E.ON Energie v Commission, C‑89/11 P, EU:C:2012:738, paragraph 125).
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