Signed graph 1

0 0 1 
0 0 1 
1 1 0 

-1.4142 0.0000 1.4142 

Signed graph 2

0 1 1 
1 0 1 
1 1 0 

-1.0000 -1.0000 2.0000 

Signed graph 3

0 -1 1 
-1 0 1 
1 1 0 

-2.0000 1.0000 1.0000