Now, for each ring, we are going to center inner and outer circles on the Bragg ring of interest, just as if you were going to make a q-chi plot of that ring. This will tell Datasqueeze over what region it should do the least-squares fit. You want to make sure that the inner ring is everywhere at smaller radius, and the outer ring everywhere at larger radius, than the feature of interest, and also that no other strong features are included within that region. If you cannot accomplish this you may need to back up (using "Back") and improve the centering (small-angle mode) or scale estimation (wide-angle mode)