Below you find a description of the singular graph of this spine:
Graph code :
1 V9 V1 2 V9 V1 3 V9 V6 4 V9 V6 5 V1 V7 6 V1 V7 7 V6 V5 8 V6 V3 9 V5 V3 10 V7 V4 11 V5 V4 12 V7 V2 13 V3 V2 14 V4 V2 15 V5 V8 16 V3 V8 17 V4 V8 18 V2 V8
The first column lists the edges, given by their numbers. V9, V1, etc. are names of vertices. The first line says that edge 1 is goes from vertex V9 to vertex V1, the second -- that edge 2 does the same, and so on. In particular, the edges are oriented.