you could check the following: B*^8kc:)L
*qKf!&
- if the surface/element tilt is too large %:.IG.`d
3A'9=h,lVK
- enough analysis rays used? Q(BM0n)f
v%)=!T,
- have you used Coherent Data option under Detector setting. RY9Ur
6)1xjE#
Someone above was right about that the non-sequential mode only uses geometric rays but you could see inteference fringes using Coherent Data.