LAMMPS CG-SPICA example problems Each of these sub-directories contains a sample problem for the SPICA (formerly called SDK) coarse grained MD potentials that you can run with LAMMPS. These are the two sample systems peg-verlet: coarse grained PEG surfactant/water mixture lamella verlet version this example uses the plain LJ term only, no charges. two variants are provided regular harmonic angles and the SPICA variant that includes 1-3 LJ repulsion. sds-monolayer: coarse grained SDS surfactant monolayers at water/vapor interface. this example uses the SPICA LJ term with coulomb and shows how to use the combined coulomb style vs. hybrid/overlay with possible optimizations due to the small number of charged particles in this system