Table 4.

Phasing statistics

Parameters	Values
Derivative	Uranium acetate
Number of sites	2
Rder a(%)	16.0
Rcullis b,c	0.76
Phasing powerb,d	2.05
Figure of merit	0.63
a Rder=∑∣FPH−FP∣/∑∣FP∣, where FPH is the structure factor amplitude of the derivative crystal and FP that of the native.
b Acentric reflections.
c Rcullis=∑∣∣FPH±FP∣−∣FH(calc)∣/∑∣FPH−FP∣, where FPH and FP are defined as above and FH(calc) is the calculated heavy atom structure factor amplitude summed over centric reflections.
d Phasing power=F(H)/E, the r.m.s. heavy atom structure factor amplitude divided by the lack of closure error.