Sets the dielectric constant for the solvent
to n.nn. Presence of this keyword will cause the
Screening Model) method  to be used to approximate the effect of a
solvent model surrounding the molecule. Solvents with low dielectric constant
are not likely to work well in this model. A test is
provided to allow COSMO to be validated.
To alter the Van der Waals radius, use VDW.
See also RSOLV, DISEX,