Table 2.

Helix positions for halorhodopsin found by direct methods.

Position	This determination		Image analysis
	x/a	y/b	x/a	y/b
1	0.199	0.018	0.201	0.016
2	0.199	−0.069	0.211	−0.078
3	0.237	−0.164	0.239	−0.144
4	0.330	−0.180	0.339	−0.188
5	0.404	−0.114	0.378	−0.115
6	0.306	−0.045	0.319	−0.045
7	0.294	0.042	0.294	0.045