6. The Commission is empowered to adopt implementing acts laying down detailed rules to clarify the common methodology referred to in paragraph 1 of this Article and to ensure its uniform implementation on the market as regards the approach for determining appropriate emission-relevant parameters for calculating greenhouse gas emissions before a transport service is provided, and, where applicable, laying down other technical parameters related to the allocation of greenhouse gas emissions or the aggregation of data elements that are not explicitly explained in that common methodology. Those implementing acts shall be adopted in accordance with the examination procedure referred to in Article 18(2).