[Chimera-users] Surprising "measure symmetry" result
ingvar at ebi.ac.uk
Fri Apr 4 02:53:26 PDT 2014
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,
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.
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