  distance = Angstroms 
    <LI>
    time = femtoseconds 
    <LI>
    mass = grams/mole 
    <LI>
    temperature = degrees K 
    <LI>
    pressure = atmospheres 
    <LI>
    energy = Kcal/mole 
    <LI>
    velocity = Angstroms/femtosecond 
    <LI>
    force = grams/mole * Angstroms/femtosecond^2 
</UL>
<PRE>
option lj = LJ reduced units:
</PRE>
<UL>
    <LI>
    distance = sigmas 
    <LI>
    time = reduced LJ tau 
    <LI>
    temperature = reduced LJ temp 
    <LI>
    pressure = reduced LJ pressur