Initial minimization
 &cntrl
  ntx    = 1,       irest  = 0,       ntrx   = 1,      ntxo   = 1,
  ntpr   = 20,      ntwx   = 0,       ntwv   = 0,      ntwe   = 0,

  ntf    = 1,       ntb    = 1,
  ntc    = 1,       ntr    = 1,
  restraintmask = ':1',
  restraint_wt = 100.0,
  cut    = 9.0,

  imin   = 1,
  maxcyc = 1000,
  ncyc   = 100,

 &end
