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Fig. 2. Maps of yield classes at Sites A (Clay Center, left) and B (Cairo, right) as affected by aggregation method (PCI: prior-classification interpolation; PCF: postclassification filtering) and cell size used for interpolation in PCI or windows size used for PCF (4–64 m). All maps shown are for hierarchical cluster analysis using Ward's method. Light colors show high-yielding areas; dark colors show low-yielding areas with high yield variability among years. At Site A, the circle indicates the center-pivot–irrigated area.
