. Author manuscript; available in PMC: 2015 Oct 23.

Published in final edited form as: Acta Crystallogr D Biol Crystallogr. 2001 Dec 21;58(0 1):29–38. doi: 10.1107/s0907444901017267

Table 2.

phasing statistics for the heavy atom derivatives

			“Isomorphous”		“Anomalous”
Compound	Sites	Resolution (Å)	R_cullis	PP	R_cullis	PP
Native	0	2.6
Me₃Pb	6	2.8	0.87	1.64	0.80	1.55
OAcHg2	4	2.6	0.77	1.74	0.92	1.06
PCMB	2	2.8	0.99	0.16	1.00	0.17
Mersalyl	0

The R_cullis is defined here as R_cullis= (<phase-integrated lack of closure> / < | F_PH - F_P | >) and phasing power(PP) as PP= (< | F_Pcalc | / phase-integrated lack of closure >) from SHARP in shell 4.6–5.8 Å, for acentric reflections. F_P and F_PH represent respectively the structure factors for the protein and derivative.