[Chimera-users] Surprising "measure symmetry" result

[ingvar]

Hello,

I fetched entry EMD-2463 from EMDB and issued:
measure symmetry #0 nMax 24
and got the result "Symmetry emd_2463.map: C13, center 64 64 37"

Increasing the number of sampling points does not change the result, 
but
if I increase the correlation criteria a little, to say 0.992, I get 
the expected C12 symmetry.
Also if I change the contour level to 0.05, the author recommended 
level, I get C12 again.

Looking at the volume at several different contour levels, it is 
difficult to see how it could be considered C13, and also how it would 
go from C13 to C12.

Kind Regards,
Ingvar Lagerstedt
-- 
Ingvar Lagerstedt
European Bioinformatics Institute (EMBL-EBI)
European Molecular Biology Laboratory
Wellcome Trust Genome Campus
Hinxton
Cambridge CB10 1SD

Tel: +44 (0)1223 492533