Table 3. Limits of reciprocal-space functions.

Although atoms are normally not included in the unit definition, they are included here for clarity.

Function	Low-Q behavior	High-Q behavior	Units
I(Q)			Barn atom
S(Q)	η	1	Unitless
F(Q)	(η − 1)Q	0	Å−1
F K(Q)	〈b coh〉2(η − 1)	0	Barn