[GSAS-II] GSAS-II Model selection

[kasa belachew]

It is so good, that, GSAS-II computes the crystallite sizes (  *10-6* m) in
three different (isotropic, uniaxial and ellipsoidal) and Microstrains
(isotropic, uniaxial and generalized) arrangement.
Q1# Can we use more than one model for the same material?
Q2# Why the value became different with different model of the same
material?
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