Thank you! There is no exact definition of the reference zone in the HKL2000 manual. Given a reciprocal lattice observed from one direction, there may be several RotXYZs to reach it. It might be that the reference zone is a sampling parallelogram from the real space used to determine the orientation difference with its counterpart(s) in reciprocal space that has been established by reverse projecting of spots from the CCD to the Ewald sphere. Thanks a lot!
Best wishes, Shiqiang Lin On Tue, May 13, 2014 at 5:14 PM, Felix Frolow <[email protected]>wrote: > these are symmetry alternative choices of the cell axes > they sure are the same as there are 14 Bravais lattices > I guess it is not space group related. > they were introduced to maintain a precision of calculationI guess, so to > choose and alternative orientation were trigonometric parameters > are in the region were small change in angle does not bring large change > in the trigonometric function (or vice versa) > > FF > > Dr Felix Frolow > Professor of Structural Biology and Biotechnology, Department of > Molecular Microbiology and Biotechnology > Tel Aviv University 69978, Israel > > Acta Crystallographica F, co-editor > > e-mail: [email protected] > Tel: ++972-3640-8723 > Fax: ++972-3640-9407 > Cellular: 0547 459 608 > > On May 13, 2014, at 23:19 , 林世强 <[email protected]> wrote: > > Hi everybody! I met with a problem when I was reading the HKL2000 online > manual. It's the reference zone setup in the "Step 11: What is the > reference zone? How is this useful? (page 38, figure 38)". Does anybody > know the definition of reference zone, and why the reference zone setup > window seems always contain the same 10 options, h0l, hk0, l0h, kh0, ..., > 0-kl? Thanks. > > Best regards, > > Shiqiang Lin > > > >
