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Low Temp refinement.

Wed Apr 10 19:58:27 EST 1996

Of course the refinement should proceed until some Free-R is achieved that 
is commensurate with the R-merge of the original data.  

We found once that the High-temperature model ended up mis-placed in the 
unit cell.  The cell had shrunk by about 2.5% in one direction on freezing. 
The coordinates of the warm model were in Ang. units.  When they were 
transformed into fractional coords in the new cell, they were about an Ang. 
away from where they should be.  Ultimately the structure yielded R-free = 
0.18 for data 10-1.6Ang.

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