you could check the following: tf{o=X.)
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- if the surface/element tilt is too large 26-K:"
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- enough analysis rays used? A~wVY
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- have you used Coherent Data option under Detector setting. %H7H0%qW
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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.