kxw940
When doing a Refinement or Pawley fit you get blue hkl ticks which show the allowed reflections however when you run your mouse over them yellow tick marks appear above the blue ones. I have searched the TOPAS technical reference and can't seem to find out what they are. Are they disallowed reflections?
johnsoevans
I'm not sure what you mean by this. The yellow boxes give you (hkl) values and d-spacings for the blue tick marks.
mfisch
I remember having seen this on one computer running XP and Topas Academic 4. After some Windows updates, it disappeared again.
kxw940
They look exactly like the blue hkl tick marks that give you the hkl values and the d-spacing but are yellow and are just above the blue tick marks. They don't however if you hold your mouse over them give you any information such as d-spacing. I was just wondering whether they are disallowed reflections as the blue ones show all the allowed hkl values within your space group and they line up with a few peaks that we know don't fit the current space group.
mfisch
As I wrote: I think it is some graphics issue on some computers.
olli1183
I think I've also seen them on older versions of TOPAS before and it's a graphic issue. However, if you want to test your hypothesis of unallowed reflections, just put in a hkl-Phase with same lattice parameters and use the space group with lowest number of the respective crystal system (instead of the right space group). For those space groups, all reflections will be allowed. Then you can compare those tickmarks with your yellow ones.
But I would bet a beer on the graphics issue.