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I just wanted to double-check something here:

How do the import/export programs treat CNS/XPLOR files in relation to MTZ files? I have been switching back and forth between formats for reasons best left unexplained, and I've been using 0 as the test flag in both CNS and CCP4. At one point I discovered that a file that had gone from MTZ->CNS->MTZ ended up with the test set marked 1 and the rest marked 0 - and I was refining against my 5% Rfree reflections alone.

Do any of the programs change the flag? I would prefer to keep the same convention in both formats - e.g. the CCP4 standard of 0-19 with 0 the test set. At some point this appears to break.

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