Problems: Difference between revisions

Jump to navigation Jump to search
3 bytes removed ,  14 September 2015
m
→‎IDXREF.LP does not show the expected lattice: you do not to know -> you do not know
m (→‎IDXREF.LP does not show the expected lattice: you do not to know -> you do not know)
Line 196: Line 196:
If the data reduction fails nevertheless (in terms of bad R-factors and [[CORRECT#An estimate for the overall quality of an experimental setup|ISa]] in the [[CORRECT]] step), then chances are that you specified some parameter wrongly, or not accurate enough (ORGX and ORGY are the most likely candidates), or that the crystal does not match your idea about its spacegroup and unit cell. Actually the latter happens pretty frequently (which is why it is always the safest way to collect 180° of spindle rotation unless you know your crystals very well; this is also a good strategy in other respects).
If the data reduction fails nevertheless (in terms of bad R-factors and [[CORRECT#An estimate for the overall quality of an experimental setup|ISa]] in the [[CORRECT]] step), then chances are that you specified some parameter wrongly, or not accurate enough (ORGX and ORGY are the most likely candidates), or that the crystal does not match your idea about its spacegroup and unit cell. Actually the latter happens pretty frequently (which is why it is always the safest way to collect 180° of spindle rotation unless you know your crystals very well; this is also a good strategy in other respects).


If you tell XDS that you do not to know the spacegroup (SPACE_GROUP_NUMBER= 0), then [[IDXREF]] takes all observed reflections into account. By design, the spacegroup decision is then postponed until the CORRECT step, or rather to a run of [[pointless]] after CORRECT, and it may be not vital to closely inspect IDXREF.LP, because CORRECT.LP has basically the same information, plus more.
If you tell XDS that you do not know the spacegroup (SPACE_GROUP_NUMBER= 0), then [[IDXREF]] takes all observed reflections into account. By design, the spacegroup decision is then postponed until the CORRECT step, or rather to a run of [[pointless]] after CORRECT, and it may be not vital to closely inspect IDXREF.LP, because CORRECT.LP has basically the same information, plus more.


=== none of the lattices in IDXREF.LP (except aP) has a good QUALITY OF FIT ===
=== none of the lattices in IDXREF.LP (except aP) has a good QUALITY OF FIT ===
7

edits

Cookies help us deliver our services. By using our services, you agree to our use of cookies.

Navigation menu