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Nonstationarities in Hydrologic and Environmental Time Series Rutilius Taurus Aemilianus und sie führt zu einerConventionally, time series have been studied either in the time domain or the frequency domain. The representation of a signal in the time domain is localized in time, i. e . the value of the signal at each instant in time is well defined . However, the time representation of a signal is poorly localized in frequency , i. e. little information about the frequency content of the signal at a certain frequency can be known by looking at the signal in