I totally agree. And because the new dataset is of higher resolution, there will be new reflections in the test set anyway.

Now if you want to use the same testset always for series of isomorphous datasets (even though you do not need to), you can do this:
- Use unique to make a full set of reflections given your space group and cell dimensions
- Assign a testset to that file using the program freerflag
Foreach dataset:
- Copy over the testset from you master file
End

Note that the testsets in the datasets will be super/subsets of each other but assuming the data are complete they will be the same if you use the same resolution cut-offs.

Cheers,
Robbie

On 17 Sep 2019 02:17, Tim Gruene <[log in to unmask]> wrote:

Dear Mariana,

you can simply create a new set for Rfree, independently of the previous one.
It will be as good as the copied one, and there is no reason why you would
need to maintain the same flags. As Ian Tickle explained only briefly ago,
your new data set will have new, independent errors.

Best regards,
Tim

On Tuesday, September 17, 2019 12:29:19 AM CEST Mariana Ajalla wrote:
> Dear all,
>
> We tried to use the Rfree set from a lower resolution data with a higher
> resolution from the same Crystal. To do so We used aimless at ccp4i with
> the option use free flag from another mtz file and extend the data.
>
> I think it worked, but now we don't know how to be sure we have the same
> Rfree set. Does anyone have a way to prove it?
> Thank you in advance,
> Best,
> Mariana
>
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Tim Gruene
Head of the Centre for X-ray Structure Analysis
Faculty of Chemistry
University of Vienna

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