you could check the following: aV6l"A]
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- if the surface/element tilt is too large +=qazE<:0
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- enough analysis rays used? YdT-E
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- have you used Coherent Data option under Detector setting. 4wa8Vw`
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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.