A surgical table includes a horizontal patient support with a base extending therefrom and supporting the patient support at a desired height. An in situ mask is formed on a photosensitive element, the element is exposed to actinic radiation through the in-situ mask in an environment having an inert gas and a concentration of oxygen between 190,000 and 100 ppm, and the exposed element is treated to form the relief printing form having a pattern of raised surface areas. The measured focus change from the optimal tool focus offset is monitored directly on the critical product images for both contact hole and line images. A table is organized according to geographic units of a presettable area. Furthermore, when the rotatable disk is rotated in another direction, the heat insulating plates are moved in a manner which increases the size of the discharge opening. The swing cam is swingable at a center of the support shaft, when a second roller is pressed by the cam shaft, so that the second cam surface presses the first roller.