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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 particle degrees of freedom are defined. The correct name of this particle geometry is pgeom_<tag>, where <tag> is the name for the Particle Tracing interface node. 
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