PS you'll find a link to a description of all the twinning tests it runs on the server home page.
I. On Tue, Oct 8, 2024 at 4:20 PM Ian Tickle <ianj...@gmail.com> wrote: > > Dear Eleanor > > Try submitting it to the STARANISO server? That does a whole slew of > twinning tests (so you can take your pick from sometimes totally different > twin fractions from the various tests!). Also it gives you the twin > fraction rather than having you understand how to use the tests! But I > agree that the L test is one of the best, and the server uses a variant of > it which gives more accurate estimates of the twin fraction. > > Cheers > > -- Ian > > > On Tue, Oct 8, 2024 at 4:01 PM Eleanor Dodson < > 0000176a9d5ebad7-dmarc-requ...@jiscmail.ac.uk> wrote: > >> I have always had great faith in the L test and other statistics to >> detect twinning.. >> But now I have a puzzling data set. >> Seems to be orthorhombic with a, b and c all different >> One molecule/asymm unit and no NC translation.. >> BUT clear indication of twinning given by second moments, etc.. >> >> I have seen this before when the spacegroup was actually monoclinic and >> the pointless analysis of the two fold axes along a b or c showed one was >> better than the other two and in fact the crystal proved not to be twinned >> when the data was processed as monoclinic.. >> >> But in this case no amount of reprocessing gets rid of the twin indicator >> .. >> Does anyone have any suggestions of why this might be? >> ( The data quality isnt great - 2.5A but the Rmerges are reasonable..) >> Eleanor >> >> >> ------------------------------ >> >> To unsubscribe from the CCP4BB list, click the following link: >> https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=CCP4BB&A=1 >> > ######################################################################## To unsubscribe from the CCP4BB list, click the following link: https://www.jiscmail.ac.uk/cgi-bin/WA-JISC.exe?SUBED1=CCP4BB&A=1 This message was issued to members of www.jiscmail.ac.uk/CCP4BB, a mailing list hosted by www.jiscmail.ac.uk, terms & conditions are available at https://www.jiscmail.ac.uk/policyandsecurity/
