#### Description:

This attribute holds the interference order being considered. The default value is 0.

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:

  Integer.

#### Applicability

##### GrismMap

All GrismMaps have this attribute.
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