you could check the following: 36Lf8~d4"h
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- if the surface/element tilt is too large !^EA}N.u
7q:;3;"9
- enough analysis rays used? F$'po#
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- have you used Coherent Data option under Detector setting. @V&HE:P
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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.