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For Density the accumulated variable is divided by the volume of the mesh element where it is defined.
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For Count the accumulated variable is unaffected by the element size.
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For Elements the accumulated variable is proportional to the instantaneous value of the Source term R for all applicable rays.
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For Elements and time the time derivative of the accumulated variable is proportional to the instantaneous value of the Source term R for all applicable rays, and thus the accumulated variable considers the time history of rays in the modeling domain instead of just their current values.
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If Domains is selected, rays only contribute to the accumulated variable on their releasing surface while they are active (still propagating through a domain).
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If Boundaries is selected, the rays only contribute to the accumulated variable if they have become stuck or frozen to a boundary somewhere in the model.
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If Domains and boundaries is selected, all of the active, stuck, and frozen rays released by a feature can contribute to the accumulated variable.
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