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Box plots from station-wise R between in situ RZSM and SWI*T (1 km and 100 m) with Topt. The black line in the middle indicates the median R, while black dots indicate outliers. RZSM, root zone soil moisture; SWI*T-1km, converted 1 km SWI dataset; SWI*T-100m, converted downscaled 100 m SWI; Topt, optimized time length
