Case T-482/07: Judgment of the General Court of 16 September 2013 — Nynäs Petroleum and Nynas Petróleo v Commission (Competition — Agreements, decisions and concerted practices — Spanish market for penetration bitumen — Decision finding an infringement of Article 81 EC — Annual market-sharing and price-fixing arrangements — Evidence of participation in the cartel — Calculation of the amount of the fine)