65First, it must be recalled that, in a procedure seeking to impose a fine on undertakings for an infringement of Article 101 TFEU, the Commission may not confine itself to examining the evidence put forward by the undertakings, but must, as a matter of sound administration, play its part, using the means available to it, in ascertaining the relevant facts and circumstances (see, to that effect, judgment of 13 July 1966 in Consten and Grundig v Commission, 56/64 and 58/64, ECR, EU:C:1966:41, p. 347).
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