-Define Interpolator

Set to TRUE to instruct the wizard to display an object of type Interpolation as part of the input.

Note this key is prefixed by -, which indicates it is not regarded as part of the object's data.
It appears only in the wizard to help the user with the data entry task.
It is never shown in the object's contents or in the pasted spreadsheet range.
It is also never part of the exported object's data.
IMPORTANT:
In the case where the object is part of another parent object, the value shown here can be ignored as it may not be at synch with the object's contained data.