Abstract
A test of the refinement procedure for improving the crystallite orientation distribution function is presented for a
fiber texture sample of polyethylene terephthalate. This is a particularly difficult example because the triclinic unit
cell offers no simplification due to symmetry, and the pole figures are sharply peaked. The analysis employed 17
observed pole figures and an additional 29 unobserved pole figures reconstructed from the crystallite orientation
distribution function. After three cycles of refinement, in which the maximum value of the coefficient was increased
from 6 to 16, the standard deviations,