GrismNRGrismNR - The refractive index at the reference wavelength

Description:
This attribute holds refractive index of the grism material at the reference wavelength (given by attribute GrismWaveRGrismWaveR). The default value is 1.0.
Type:
Double precision.
Class Applicability:
GrismMapGrismMap
All GrismMaps have this attribute.