U F k or U B k values greater than 0 indicate an increasing trend; in contrast, U F k or U B k values smaller than 0 indicate a decreasing trend.
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VCI-Based Analysis on Spatiotemporal Variations of Spring Drought in China.
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U F k or U B k values greater than 0 indicate an increasing trend; in contrast, U F k or U B k values smaller than 0 indicate a decreasing trend.