mat6  --  Force directed placement matrix.
8	real
1  1  4.000000e+00        
1  4  -1.000000e+00       
1  6  -5.000000e-01       
1  7  -5.000000e-01       
1  8  -5.000000e-01       
2  2  4.000000e+00        
2  3  -5.000000e-01       
2  7  -1.000000e+00       
2  8  -1.000000e+00       
3  2  -5.000000e-01       
3  3  3.000000e+00        
3  8  -1.000000e+00       
4  1  -1.000000e+00       
4  4  3.000000e+00        
4  5  -1.000000e+00       
5  4  -1.000000e+00       
5  5  3.000000e+00        
5  6  -5.000000e-01       
6  1  -5.000000e-01       
6  5  -5.000000e-01       
6  6  4.500000e+00        
6  7  -1.000000e+00       
6  8  -1.500000e+00       
7  1  -5.000000e-01       
7  2  -1.000000e+00       
7  6  -1.000000e+00       
7  7  6.000000e+00        
7  8  -1.500000e+00       
8  1  -5.000000e-01       
8  2  -1.000000e+00       
8  3  -1.000000e+00       
8  6  -1.500000e+00       
8  7  -1.500000e+00       
8  8  6.000000e+00        
0  0  0.0
3.165000e+02        
3.970000e+02        
3.640000e+02        
3.000000e+02        
6.490000e+02        
4.335000e+02        
3.905000e+02        
-1.355000e+02