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Fig. 5. Spatial distributions of selenium concentrations in A-, B-, and C-horizon soils in Guangdong Province, China. Red line areas (<0.125 mg kg^–1): selenium deficiency areas; yellow line areas (0.125–0.175 mg kg^–1): selenium marginal areas; green line areas (0.175–0.4 mg kg^–1): selenium medium areas; outer areas of green line (>0.4 mg kg^–1): selenium adequate areas.