 PSF

   1 !NTITLE
     Topology file for argon

     1  !NATOM
       1 ARG     1 ARG  Ar   Ar         0.000000     39.948000       0

     0  !NBOND

     0   !NTHETA

     0   !NPHI

     0   !NIMPHI

     0   !NDON

     0   !NACC

     0   !NNB

