Article 9 — Establishing output data on greenhouse gas emissions from a transport service

1. Output data shall be established by using the common methodology and input data in accordance with Articles 3 to 7. 2. The output data may be established using calculation tools. External calculation tools shall comply with the requirements laid down in Article 11. 3. The output data as a minimum shall consist of the total mass of carbon dioxide equivalent (CO2e) per transport service, and, in relation to a type of transport service concerned, at least one of the following common metrics: (a) mass CO2e per tonne kilometre, or equivalent units, for freight transport; (b) mass CO2e per tonne, or equivalent units, for freight hub throughput; (c) mass CO2e per passenger kilometre, or equivalent units, for passenger transport; (d) mass CO2e per passenger, or equivalent units, for passenger hub throughput. 4. The Commission is empowered to adopt delegated acts in accordance with Article 17 to supplement this Regulation by complementing the list of common metrics for output data referred to in paragraph 3 of this Article.