Minimzing the system with 25 kcal/mol restraints on DNA, 500 steps of
steepest descent and 500 of conjugated gradient
 &cntrl
 imin=1,
 ntx=1,
 irest=0,
 ntpr=50, 
 ntf=1, 
 ntb=1,
 cut=9.0,
 nsnb=10,
 ntr=1, 
 maxcyc=1000,
 ncyc=500,
 ntmin=1,
 restraintmask=':1-24',
 restraint_wt=25.0,
  &end
  &ewald
   ew_type = 0, skinnb = 1.0,
  &end