onebond {<onebond-statement>} end

<onebond-statement> :==

  assign <atom-selection> <atom-selection> <atom-selection> <atom-selection>
         <atom-selection> <atom-selection> <atom-selection> <atom-selection>
         <real> <real>
  --{Atom-i atom-j atom-k atom-l atom-m atom-n atom-p atom-q J-obs J-err.}
  class=<classname>
  --{Starts a new class which applies to all assignment, type, 
     force, and flat entries until another class entry is issued.}
  coefficients <real> <real> <real> <real> <real> <real> <real>
  --{Set the curve coefficients  A, B, C, D and the 
     Karplus curve phases P1, P2, and P3 (in that order) for this class.}
  force=<real>
  --{Force constant for all assignments in the current class. Default=50}
  nrestraints=<integer>
  --{Number of slots for one-bond J coupling restraints to allocate
     in memory. Default=200}
  potential=square|harmonic
  --{Use J coupling error or not.}
  print threshold <real>
  --{Prints one-bond J-coupling violations greater than the specified
     value (in Hz).}
  reset
  --{Erases the one-bond J-coupling assignment table but keeps
     nrestraints the same.}