An improved serving method and apparatus are disclosed for use in rotary catering table equipment having a rotary conveyer on which merchandise items are conveyed around. The system includes a table that rotates about an axis of rotation for supporting a cargo container, an X-ray source movable parallel to the rotation axis of the table on one side of the table, and an X-ray detector movable parallel to the rotation axis of the table on another side of the table. The method further includes generating a second logical page. The rib is located between the outer wall and the electronic component, and the outer surface of the rib faces the inner surface of the outer wall. The toner container also includes a projection provided near the discharge port and at one end of a top surface of the cover portion in a longitudinal direction, wherein a height of a surface of the projection facing the rear edge is declined towards the rear edge. Preferably, the graphic representation is a histogram representative of activity levels within the trace data.