Shots can be represented as different spheres. Four interchangeable outer collimator helmets with beam channel diameters of 4, 8, 14, and 18 mm are available for irradiating different size volumes.

A cathode ray tube, CRT, you either remove the plastic housing around the tube, this is easy enough, or you work through the vent panels in the top of the housing.

Secondary xylem consists of pitted vessels, parenchyma fibers and rays.