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 > >
