
    <LI>
    fene/standard = attractive logarithmic term, repulsive LJ 
    <LI>
    fene/shift = same as fene/standard with shift of bond distance 
    <LI>
    nonlinear = non-linear finite-extension spring (van Swol) 
    <LI>
    class2 = class 2 bonds 
</UL>
<PRE>
define style of bond interactions to use between all bonded atoms
must be used before the &quot;read data&quot; command (if not using the
  default) to tell the program how to read the &quot;Bond
  Coeffs&quot; entry in the data file (if one