you could check the following: NYR:dH]N~d
xSq+>, b
- if the surface/element tilt is too large g$z6*bL
*#GX~3A
- enough analysis rays used? ]=Wq&~
<B+
WM
- have you used Coherent Data option under Detector setting. %B\VY+
)W1[{?
Someone above was right about that the non-sequential mode only uses geometric rays but you could see inteference fringes using Coherent Data.