13. In some cases when diagramming a group, net, or network, the analyst may come across
a signal facility used by two or more units (i.e. an air unit, missile units, and a headquarters
element). When this occurs and it is noted that several units are using the same signal facility
it is called COLLOCATION and may be represented as depicted in Figure 1-6.
Figure 1-6. "Collocation".
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