90That exercise involves, in accordance with Article 23(3) of Regulation No 1/2003, taking into consideration, with respect to each undertaking sanctioned, the seriousness and duration of the infringement at issue, in compliance with the principles of, inter alia, adequate reasoning, proportionality, the individualisation of penalties and equal treatment (see, to that effect, judgments in Commission and Others v Siemens Österreich and Others, C‑231/11 P to C‑233/11 P, EU:C:2014:256, paragraphs 53 and 56; Guardian Industries and Guardian Europe v Commission, C‑580/12 P, EU:C:2014:2363, paragraph 75; and Commission v Parker Hannifin Manufacturing and Parker-Hannifin, C‑434/13 P, EU:C:2014:2456, paragraph 77), and without the Court being bound by the indicative rules defined by the Commission in its guidelines (see, by analogy, judgment in Italy v Commission, C‑310/99, EU:C:2002:143, paragraph 52), even where the latter may give guidance to the EU Courts when they exercise their unlimited jurisdiction (see, to that effect, judgment in Commission v Verhuizingen Coppens, C‑441/11 P, EU:C:2012:778, paragraph 80 and the case-law cited).
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