This example contains a mixture of water(SPCE) and methane.
The methane molecules use OPLSAA force-field, but the water molecules do not.

---- Details ----

The methane molecules in this example use the OPLSAA force-field.  This means
that when we define "Methane", we only specify the atom names, bond list, 
and coordinates.  We then use oplsaa_moltemplate.py and moltemplate.sh to load
the OPLSAA force-field parameters (and atom charges) for the Methane molecule
from an external file ("oplsaa.lt".  Read the "oplsaa_lt_generator/README.TXT"
file for details.)  Consequently, the "moltemplate_files/methane.lt" file 
contains these lines which refer to OPLSAA:

import "oplsaa.lt"
Methane inherits OPLSAA { ...

However the "SPCE" (water) molecules does NOT use a database to look up the
force-field parameters for this tiny molecule.
Instead, the "moltemplate_files/spce.lt" file declares all of the angle
interactions, atom properties and force-field parameters for water explicitly.
(Consequently, it makes no mention of "oplsaa.lt" or "OPLSAA".)


-------- Instructions: ---------

More detailed instructions on how to build LAMMPS input files and 
run a short simulation are provided in other README files.

step 1)
README_setup.sh

step 2)
README_run.sh
