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Fig. 37: a) Indicator time series and best fitted trend with autoregressive model (AR0: no autoregression; AR1: 1st order autoregressive model, AR2: 2nd order autoregressive model, AR3: 3rd order autoregressive model). Numbers in brackets indicate the confidence interval (95%) around the slope coefficient and should not include 0 to be significative. b​​​​​) Best fitted trend using the first steps of a TREC analysis on standardized time series
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