anisotropic strain in gsas

[prasunsc]

considering the CW profile function 2, can anyone tell me what is the physical 
difference between the anisotropic strain broadeining(Ye) and the strain 
ellipsoid parameters(gamma(i,j))? getting into the point.. my interest is to 
know that, how and under what condition they appear physically in the material, 
and what are their effects on the peak shape with respect to the position?
with regards,
prasun