3 atoms         
2 bonds              

1 atom types
1 bond types

-50 50 xlo xhi
-50 50 ylo yhi
-50 50 zlo zhi

Masses

1 24


Atoms 

1 1  0    0       0   1 1
2 1  10   17.32   0   1 1
3 1  20   0       0   1 1

Bonds

1 1 1 2
2 1 2 3