lammps/tools/lmp2traj/examples/lmp2traj_inp.txt

'dump.atom'
1
3
29.00000
38.26120
44.79980
90.
90.
90.
49708.7291
1
2
0.
2.
0.
2
'Bulk (1) O-water'
1
'o*'
18.6
21.0
'Bulk (1) H-water'
2
'h*'
18.1
21.5