205In so far as, by the fourth complaint, the appellants criticise the General Court’s assessment at paragraph 432 of the judgment under appeal of whether the starting amount of the fine was proportionate in the light of the relevant facts, it should be borne in mind that it is not for the Court of Justice, when ruling on points 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. Accordingly, only inasmuch as the Court of Justice considers that the level of the penalty is not merely inappropriate, but also excessive to the point of being disproportionate, would it have to find that the General Court erred in law, on account of the inappropriateness of the amount of a fine (see, to that effect, E.ON Energie v Commission EU:C:2012:738, paragraphs 125 and 126; Case C‑70/12 P Quinn Barlo and Others v Commission EU:C:2013:351, paragraph 57; and Case C‑586/12 P Koninklijke Wegenbouw Stevin v Commission EU:C:2013:863, paragraph 33 and the case-law cited).
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