This is a text description of Figure 2-5, "Topology Before Moving a Non-Isolated Node". It illustrates the topology before the movement of node N1, as explained in text before the illustration.

The topology is a 5-sided polygon bounded by edges E1, E2, E5, E7, and E10. Node N1 is in the middle of the polygon, and is attached to edges E3, E4, E6, E8, and E9.