you could check the following: km,I75o.
5ca!JLs
- if the surface/element tilt is too large T?+%3z}8
-2/&i
- enough analysis rays used? b2 5.CGF
RoLN#
- have you used Coherent Data option under Detector setting. h%UM<TZ]"
L4t(Y7
Someone above was right about that the non-sequential mode only uses geometric rays but you could see inteference fringes using Coherent Data.