Dear all: I am working on the aspherical atom refinement of a small molecule using the XD package. The program provides you with the option of selecting a refinement strategy against F or F^2. I have noticed that the R-factors and GOFs calculated based on F^2 are larger in magnitude compared to those computed based on F. Why is it so? Any comments or suggestions in this regard is welcome. Sincerely, Tuhin.
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