The analysis of the ACF h resulted

Cluster 4 is characterised by a centroid that GDC-0994 has similarities to that of Cluster 3, with irregular peaks located at 7 day intervals and a slight indication of seasonality. However, ACF-d values are higher over the whole temporal window, which is osteocytes an indication of larger persistence, and may also evidence the presence of a trend in the time series. This was confirmed by comparing the average temporal trend of the series in each group (− 0.45 μg m− 3 yr− 1 for cluster 3 and − 1.33 μg m− 3 yr− 1 for cluster 4; t-test for the difference of the means p < 0.05) obtained from the Theil–Sen estimator for each station.