These statistical data are represented in a structured way with respect to the entry points and the relative position between them, according to the plane that defines the dangerous area. For example, the element (1,1) corresponds to an entry point in the upper left corner of the rectangular antenna, the element (1,2) is the next point in the same line, (1,3) the following, and so on. Fig. 6 shows a diagram that illustrates the correspondence between the data matrix representation and the entrance point locations.