Article 9 3

3.   The average wholesale charge referred to in paragraph 1 shall be calculated by dividing the total wholesale roaming revenue received by the total number of wholesale roaming minutes actually used for the provision of wholesale roaming calls within the Union by the relevant operator over the relevant period, aggregated on a per-second basis adjusted to take account of the possibility for the operator of the visited network to apply an initial minimum charging period not exceeding 30 seconds.