67It follows from the case-law of the Court of Justice, however, that the taking into account, by virtue of the principle of equal treatment, of differences between the undertakings that have participated in a single cartel (in particular with regard to the geographic scope of their respective involvement) for the purpose of assessing the gravity of an infringement need not necessarily occur when the multipliers for the ‘gravity of the infringement’ and for the ‘additional amount’ are set but may occur at another stage in the setting of the fine, such as when the basic amount of the fine is adjusted in the light of mitigating and aggravating circumstances under points 28 and 29 of the 2006 Guidelines (see, to that effect, judgments of 11 July 2013, Gosselin Group v Commission, C‑429/11 P, not published, EU:C:2013:463, paragraphs 96 to 100, and of 11 July 2013, Team Relocations and Others v Commission, C‑444/11 P, not published, EU:C:2013:464, paragraphs 104 and 105).
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