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           manual | fromphysics 
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           fromphysics if an applicable physics interface is available, otherwise manual 
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           none or the tag of a valid physics interface 
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           none or first applicable physics interface 
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           The geometry in which the ray degrees of freedom are defined. The correct name of this ray geometry is pgeom_<name>, where <name> is the name for the Geometrical Optics or Ray Acoustics interface node. 
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