R-free very close to R

[Raman]

 I get 

       R-free = 20.4 and R = 20.3 for (TEST 10%) and

       R-free = 20.6 and R = 20.3 for (TEST 20%).

 The geometry is ok (0.017 and 3.2).
 
 Can R-free be so close to R ? Is the R-free behavior 
 with TEST % correct?

 I know that the structure is correct as it is a heavy
 atom complex of a solved native enzyme.

 chumma at purdue.edu