Case T-399/09: Judgment of the General Court of 13 December 2013 — HSE v Commission (Competition — Agreements, decisions and concerted practices — Market for calcium carbide and magnesium for the steel and gas industries in the EEA, with the exception of Ireland, Spain, Portugal and the United Kingdom — Decision finding an infringement of Article 81 EC — Price-fixing and market-sharing — Imputability of the unlawful conduct — Presumption of innocence — Fines — Article 23 of Regulation (EC) No 1/2003 — 2006 guidelines on the method of setting fines — Mitigating circumstances — Infringement committed as a result of negligence — Infringement authorised or encouraged by the public authorities)