in.mesh2d_tet
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			echo both
			units real
			atom_style atomic

			variable L equal 6
			variable w equal 2

			lattice fcc 5.405 origin 0.25 0.25 0.25
			region BOX block -$L $L -$L $L -$w $w

			boundary f f p
			create_box 1 BOX
			create_atoms 1 region BOX
			mass 1 39.95
			pair_style lj/cut 13.5
			pair_coeff 1 1 .238 3.405 13.5
			group internal region BOX

			fix AtC internal atc field
			fix_modify AtC mesh read gaussianIC2d_tet.mesh
			fix_modify AtC fields add mass_density
			fix_modify AtC output mesh2d_tetFE 1 full_text binary

			dump CONFIG all custom 10 mesh2d_tet.dmp id type x y z

			thermo_style custom step cpu temp
			timestep 0.0
			thermo 1
			run 2

lammps/examples/USER/atc/mesh/in.mesh2d_tet666de878addclammm-devel