121However, when it decides to exercise that power to impose penalties, the Commission is not free to determine how joint and several liability is to be imposed from an external perspective or, in particular, the amount of the fine in respect of which it may demand full payment by each of those held jointly and severally liable (see, to that, effect, Commission v Siemens Österreich and Others and Siemens Transmission & Distribution and Others v Commission, paragraphs 52 and 54).
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