4. For the purposes of paragraph 2, point (c)(i), competent authorities may, on a sample of time series of observations referred to in Article 7(1), point (a), of Delegated Regulation (EU) 2024/397, verify that where observations in the time series are constants over subsequent business days, the actual market data for the risk factor are unchanged. When collecting the sample, competent authorities shall consider time series characterised by a large amount of data without changes over subsequent business days.