[phenixbb] rfree flag fractions

[Yusuf Akhter]

Hi Everybody!

I am using phenix version 1.3b for refining a structure at 3 A resolution
and total number of total reflections are 12680.


I have seen a provision in phenix to change the default maximal number of
test flags to be generated and the fraction with this command line

 xray_data.r_free_flags.fraction=0.05 xray_data.r_free_flags.max_free=500


My queries are

1)when should somebody use this utility ??
2)what is minimum number of Rfree flags one should use on this
resolution and this total number of reflections??


Any kind of suggestions will be appreciated.


Cheers!
Yusuf
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