ussian = gaussian distribution of velocities 
    <LI>
    velocity = assign specific initial velocity to each atom 
</UL>
<PRE>
coeffs:  uniform
               (1) target T (temperature units)
               (2) random # seed (0 < seed <= 8 digits)
         gaussian
               (1) target T (temperature units)
               (2) random # seed (0 < seed <= 8 digits)
         velocity
               (1) x velocity component (velocity units)
               (2) y velocity component (velocity units)
        