#### Description:

This attribute holds reference wavelength. The default value is 5000 (Angstrom). The units of this attribute should be consistent with those of attributes GrismNRP and GrismG.

Note, the value of this attribute may changed only if the GrismMap has no more than one reference. That is, an error is reported if the GrismMap has been cloned, either by including it within another object such as a CmpMap or FrameSet or by calling the astClone function.

Type:

  Double precision.

#### Applicability

##### GrismMap

All GrismMaps have this attribute.
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