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The KGE's component scores highlight that much of the lower KGE skill comes from the often high and mainly positive bias, and larger variability errors. The correlation is more homogeneous, even though many of the low KGE areas also show low correlation, with exceptions, such as the the upstream part of the Niger river basin, or some catchments in the Nile basin, which show high correlation but at the same time really high positive bias and large negative variability errors.
Figure 3. Bias and variability ratio and Pearson correlation of the GloFAS v4 simulation.
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