Sigma¶

Type:	Vector<float>
Range:	[v_1, …, v_2]
Default:	-/-
Appearance:	simple
Excludes:	Amplitude, K, ThetaPhi

For a non- $\pvec{k}, \pvec{A}$ based definition of the plane wave, this parameter specifies the incidence angle by $\sigma$ -coordinates in the pupil plane (see parent).