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Box-plots representing the variability of the indices (HS, IPS, TI and ICMi) calculated basing on two different approaches (T vs T + MH). In order to provide comparable results, all the indices were normalized from 0 to 1. HS (Hydrological Stability); IPS (Specific Polluosensitivity Index); TI (Trophic Index); ICMi (Intercalibration Common Metric Index). T = traditional approach; T + MH = experimental approach.
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