38As regards the substance of the first ground of appeal, which alleges that the General Court infringed the principles of personal responsibility, proportionality and equal treatment in calculating the fine, it should be noted, first, that the principle of equal treatment is a general principle of EU law, enshrined in Articles 20 and 21 of the Charter of Fundamental Rights of the European Union. According to settled case-law, that principle requires that comparable situations must not be treated differently and different situations must not be treated in the same way unless such treatment is objectively justified. Secondly, it is also settled case-law that, when the amount of the fine is determined, there cannot, by the application of different methods of calculation, be any discrimination between the undertakings which have participated in an agreement or a concerted practice contrary to Article 101(1) TFEU. Thirdly, the Court has repeatedly held that the Commission’s practice in previous decisions does not itself serve as a legal framework for the fines imposed in competition matters and that decisions in other cases can give only an indication for the purpose of determining whether there is discrimination (see, to that effect, judgment of 11 July 2013, Ziegler v Commission, C‑439/11 P, EU:C:2013:513, paragraphs 132 to 134).
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