This instrument examplifies how NCrystal may be used in Union
constructions. It is adopted from NCrystal_example.instr where both
monochromator and samples are described via NCrystal_sample components. Here,
they are both described via Union components.
Examples
(Test cases in bold)
Test: Detector: powder_pattern_detc_I=1.55e-10
Input parameters
Parameters in boldface are required;
the others are optional.