experimental-design

The survey plugin has a nested structure, with question objects inside of pages, so the use of the data parameter might not be intuitive. It might be helpful to explain in the docs and/or show in examples that data must be added on the trial rather than question level. See #2546.

Experimental-design--> utils.py L178 will try to divide by zero if parameter.value is zero

possible fix is to set x1=-delta
x2=+delta

check reflectivity accuracy to see if feasible