Research Article
The Use of SPEI and TVDI to Assess Temporal-Spatial Variations in Drought Conditions in the Middle and Lower Reaches of the Yangtze River Basin, China
Figure 2
The temporal variability of the SPEI at (a) 1-month lag, (b) 3-month lag, (c) 6-month lag, and (d) 12-month lag.
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