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Principal component analysis of meteorological and hydrological factors. A1 represents the two first components for meteorological factors, and A2 the 3rd and 4th components. Red dots represent temperature factors, dark blue, rainfall, light blue, tension, green, humidity, yellow, evaporation, orange, sunlight, violet, wind speed. B1 represents the two first components for hydrological factors, and B2 the 3rd and 4th components
