Failed embedding in 3D for graph with vertices of degree 2

[nvcleemp]

It appears that embed has difficulties with graphs with vertices of degree 2. An example is the graph below:

1) 15 27 16 30 17 33 
2) 18 35 19 36 20 28 
3) 21 29 22 38 23 31 
4) 24 32 25 37 26 34 
5) 15 13 18 11 
6) 16 11 21 12 
7) 17 12 24 13 
8) 19 13 26 14 
9) 20 14 22 11 
10) 23 14 25 12 
11) 27 5 28 9 29 6 
12) 30 6 31 10 32 7 
13) 33 7 34 8 35 5 
14) 36 8 37 10 38 9 
15) 1 5 
16) 1 6 
17) 1 7 
18) 2 5 
19) 2 8 
20) 2 9 
21) 3 6 
22) 3 9 
23) 3 10 
24) 4 7 
25) 4 10 
26) 4 8 
27) 11 1 
28) 11 2 
29) 11 3 
30) 12 1 
31) 12 3 
32) 12 4 
33) 13 1 
34) 13 4 
35) 13 2 
36) 14 2 
37) 14 4 
38) 14 3

The errors are introduced in the last phase of the embedding process. Since the embedding looks fine by adding -f1,1,0 and the errors can be seen by stepping throught the third phase with -f1,1,.1, -f1,1,.2, ...