100It should also be borne in mind that, to the extent to which reliance is to be placed on the turnover of the undertakings involved in the same infringement for the purpose of determining the proportions between the fines to be imposed, the period to be taken into consideration must be ascertained in such a way that the resulting turnovers are as comparable as possible. Consequently, an individual undertaking cannot compel the Commission to rely, in its case, upon a period different from that used for the other undertakings, unless it proves that, for reasons peculiar to it, its turnover in the latter period does not reflect its true size and economic power or the scale of the infringement which it committed (see judgment of 11 July 2014, Sasol and Others v Commission, T‑541/08, EU:T:2014:628, paragraph 334 and the case-law cited).