Surely the original poster meant "alternate indexing possibilites" (as discussed in http://www.ccp4.ac.uk/dist/html/reindexing.html; for his space group there are indeed 2 ways to index), not "alternate origins".

Kay

Meyer, Peter schrieb:
Doubtlessly I'm confused, but my understanding was that alternative origins 
would only be an issue once a dataset was phased (so that wouldn't cause 
problem during integrating/scaling).  I'd thought that using a consistent unit 
cell during indexing and scaling was a separate issue.

Any chance you could clear up what I'm missing?

Thanks,

Pete


#################################################################################################
This is what I would do in your position.

1) Integrate everything in MOSFLM
2) Enforce consistent indexing using POINTLESS (unless I am mistaken, there
are alternative origin(s) in p321)
http://www.ccp4.ac.uk/dist/html/alternate_origins.html
ftp://ftp.ccp4.ac.uk/ccp4/6.0.2/prerelease/pointless.html
3) Bundle ALL integrated datasets into one .mtz file (being such to make
sure all the batch number do not conflict)(POINTLESS may do this for you
now)
4) Push through SCALA/Truncate in one giant run - selecting your 'best'
dataset as a reference.

Scala should use all the reflections you give it, not just the overlapping
ones

The rejection of redundant reflections should only really be done if you
have a very good reason - redundancy (hopefully) adds to the quality of your
data

Scala/Truncate will give you masses of stats for individual datasets, and
how well they scale together.

At the end you should get a single .mtz file containing all your reflections
scaled together and converted to Fs.

Hope this helps,

David




--
Kay Diederichs                http://strucbio.biologie.uni-konstanz.de
email: [EMAIL PROTECTED]    Tel +49 7531 88 4049 Fax 3183
Fachbereich Biologie, Universität Konstanz, Box M647, D-78457 Konstanz

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