Central axis of the beam definition

Central axis of the beam means a line passing through the virtual source and the center of the plane figure formed by the edge of the first beam limiting device.
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Central axis of the beam means a line passing through the origin of the source and the center of the plane figure formed by the edge of the secondary collimating jaws when in a symmetric mode.
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Central axis of the beam means the line passing through the source of the beam
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