3. The use of secondary data for calculating the greenhouse gas emissions from a transport service shall be allowed under the following conditions:
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(a)
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where default values for greenhouse gas emission intensities are derived from:
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(i)
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the core Union database of default values for greenhouse gas emission intensities (‘core Union database’) referred to in Article 5; or
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(ii)
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databases and datasets of default values for greenhouse gas emission intensities operated by third parties in accordance with Article 6;
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(b)
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where default values for greenhouse gas emission factors for the transport energy carriers are derived from the central Union database of default values for greenhouse gas emission factors (‘central Union database’) referred to in Article 7;
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(c)
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where modelled data rely on a model established in accordance with the common methodology referred to in Article 3(1), and, where appropriate, in accordance with the conditions for the use of secondary data set out in points (a) and (b) of this paragraph, and with the provisions regarding the use of calculation tools set out in Articles 8 and 11.
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In conformity with the common methodology, where transport and hub entities perform an ex ante calculation of greenhouse gas emissions from a specific transport service, they may use default values for greenhouse gas emission intensities established on the basis of primary data from a transport service of similar characteristics conducted by the same entities within the year preceding the ex ante calculation.