Dear All,

I was trying to use GSAS to do phase analysis with two phases and one
histogram. But powpref hangs up the program each time I run it (after 
two phases were setup and the histogram was read in). I think I am running
GSAS version 6 on Irix 5.3, and when I run powpref with only one phase
there seems to be no problems.

Does anyone experience similar problems before? I would greatly appreciate
any advice or comments here.

Another question is not that urgent but has puzzled me for a while. I
noticed when using different peak cut-off values to treat (run powpref)
histograms (w in setting up the histogram) in GSAS, the statistics
can sometime change quite a bit. What's the physical significance of this
w? And how should we properly set its value in refinement (the default is 
1% I think)?

Thank very much for your help in advance.

Tao
11/30/98

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