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[sdpd] funtamental profile parameters U, V, W ?



Dear All,
 
I'm having pain in estimate the initial value for U, V, W for extracting structure factors by Fullprof. I often got error the message "square of FWHM <0". 
 
Could anyone tell me how what's the general approach to estimate these funtamental parameters? (Especially for synchrotron powder diffractometers)
 
Thank you very much for your kind help!
 
Sincerely Yours,
 
XIA Changtai
Universidad de Chile
Departamento de Fisica
Av. Blanco Encalada 2008
Casilla 487-3
Santiago-CHILE
cxia...@cec.uchile.cl