slab correction
  factor or a volume correction for the extended z direction
must be set before data or restart file is read

Default = none (normal 3-D Ewald/PPPM)
</PRE>
<HR>
<H3>
<A NAME="_cch3_931276666">special bonds </A></H3>
<UL>
    <LI>
    charmm (0.0 0.0 0.0) 
    <LI>
    amber (0.0 0.0 0.5/0.8333) 
    <LI>
    1st parameter = nonbond weight applied to 1-2 neighbors 
    <LI>
    2nd parameter = nonbond weight applied to 1-3 neighbors 
    <LI>
    3rd parameter = nonbond weight applied to 1-4 