you could check the following: vhrURY.
I:UN2`*#
- if the surface/element tilt is too large , }B{)
PNpH)'C|
- enough analysis rays used? ~p { fl?
!JQ'~#jKN
- have you used Coherent Data option under Detector setting. GrA}T` ]
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Someone above was right about that the non-sequential mode only uses geometric rays but you could see inteference fringes using Coherent Data.