This is a text description of move_node_1.gif. It shows the topology before the movement of node N1, as explained in text preceding 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 pologon, and is attached to edges E3, E4, E6, E8, and E9. End of description.