The Langevin NEMD procedure was also validated based on selected Lennard-Jones systems, 39;71 and the agreement was usually excellent (Figure ). Furthermore, the Langevin NEMD method and the enhanced heat exchange (eHEX) algorithm as implemented in LAMMPS 58 yield consistent results (Figure ). Therefore, it can be concluded that the Langevin NEMD procedure reliably yields Soret coefficient data for Lennard-Jones systems.