Hi I have discovered that my data in the P3 spacegroup is potentially twinned. Truncate and phenix.xtriage indicate that the twin fraction is pretty high ( between 0.35 and 0.42).
I am still new to twinned data refinement and still dont know which twin law to pick from the three possibilities for P3 that xtriage lists.

I am emailing because , Regardless of the twin law I try , phenix.refine crashes with a Segmentation fault on my Mac Pro leopard 10.5.2 running phenix. 1.3b-rc6
The command that ends with a Python crash and segmentation fault is

Command used:

phenix.refine cy_p10_2_28.1.pdb cy_p10_2_28.1_unique1.mtz simulated_annealing=true model.ncs refinement.main.ncs=true --overwrite refinement.ncs.excessive_distance_limit=None strategy=group_adp+individual_sites twin_law='-h,-k,l' refinement.input.xray_data.labels=F_p10-2,SIGF_p10-2 > phenix_run2_mhmkl_simulanneal.log

phenix.xtriage outputs

Statistics depending on twin laws
------------------------------------------------------------------
| Operator | type | R obs. | Britton alpha | H alpha | ML alpha |
------------------------------------------------------------------
| -h,-k,l   |   M | 0.100 | 0.406         | 0.407   | 0.393    |
| h,-h-k,-l |   M | 0.071 | 0.426         | 0.439   | 0.458    |
| -k,-h,-l |   M | 0.090 | 0.411         | 0.417   | 0.415    |
------------------------------------------------------------------

Can you tell me if there is something I am doing wrong .
Thanks a tonne for your help
Hari Jayaram
Postdoc , Brandeis University