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Dear All, Thanks for your emails. I think I figured it out. In Aimless I checked Customise symmetry determination and Choose a previous solution. Then I entered the space group name under Options for Pointless > Choose solution from search by > Space group name. In the Aimless log file, I see why the program was opting for a different space group. However, I wanted to specify a space group to see the end result. I also found this article, which clarified point groups a little: http://pd.chem.ucl.ac.uk/pdnn/symm2/group32.htm Sincerely, Gyl On Sun, Jan 24, 2016 at 10:09 PM, Christian Roth <[log in to unmask] > wrote: > As Eleanor pointed out XDS doesn't give you a definite answer, as the > program doesn't check for screw axes f.e. > I would read the pointless logfile (part of the aimless super task) which > does the analysis and suggests the most likely space group, to see why it > changes it. If you are certain about your sg you can override it and define > the sg or just take the sort option. > > Christian > > > On Sun, Jan 24, 2016 at 9:59 PM, Eleanor Dodson <[log in to unmask] > > wrote: > >> Read thhe pointless log. It gives a good analysis of possible spacegroupd >> and can usually be trusted. >> \ >> There are more point groups than Bravais lattices - described in most >> crystallography text books, or try Wikapedia! >> Eleanor >> >> On 24 January 2016 at 20:35, Chris Fage <[log in to unmask]> wrote: >> >>> Dear Eleanor, >>> >>> Pardon me, I am learning these terms. Is point group similar to the >>> Bravais type in XDS? >>> >>> I picked space group 5 (C2) in XDS and Aimless changed it to P21. >>> >>> Sincerely, >>> Gyl >>> >>> On Sun, Jan 24, 2016 at 9:17 PM, Eleanor Dodson < >>> [log in to unmask]> wrote: >>> >>>> Doesn't XDS only choose a point group? >>>> Eleanor >>>> >>>> On 24 January 2016 at 19:31, Gyl <[log in to unmask]> wrote: >>>> >>>>> Dear All, >>>>> >>>>> Pardon the newbie question. I processed my data in XDS and scaled in >>>>> Aimless. How can I stop Aimless from changing the space group I picked in >>>>> XDS? Thank you in advance. >>>>> >>>>> Sincerely, >>>>> Gyl >>>>> >>>>> >>>>> >>>> >>> >> >