54In the second place, recital 92 of the contested decision clearly omits to state what the Commission explained belatedly — and in a way that could not remedy the inadequacy of its reasoning or total failure to state reasons (see the case-law cited in paragraph 46 above) — only in the course of the proceedings, by providing substantive additional reasons, namely that, unlike the other undertakings involved, Hamelin’s business concerned the production of more than just one product and the adjustment of the basic amount for that company was justified, in any event, on equitable grounds and the need to redress the balance between the various fines (see paragraphs 34 and 35 above). Accordingly, in the light of those further explanations, contrary to the impression that might be given by recital 91 of the contested decision, the decisive factor in the Commission’s appraisal when adjusting the basic amounts was not the fact that there were ‘differences between the parties in view of their individual participation in the infringement’, which, in the case of Hamelin, was only slightly less, as it participated in the infringement for a period of 4.416 years, as opposed to 4.5 years in the case of the other undertakings concerned. Furthermore, contrary to what the applicants would appear to have understood, that recital cannot be construed as referring to the lesser degree of participation in the infringement by Mayer-Kuvert alone, as that had already given rise to a 10% reduction for mitigating circumstances, for the purpose of paragraph 29 of the Guidelines (recitals 85 and 87 of the contested decision), that is, before the contested adjustments were made to the basic amounts, as set out in recitals 88 et seq. of the contested decision.