FEHALO — Specify the fraction of non-hydrogenic solvent atoms that are electronegative halogen atoms.
 FEHALO=n.nn
			
               			The FEHALO=n.nn keyword specifies the fraction of
               			non-hydrogenic solvent atoms that are electronegative halogen atoms (fluorine, chlorine, and
               			bromine). Hence, the value must necessarily be between zero and one for all solvents. The file
               			solvent.data
               			contains values of FEHALO for many common organic solvents, but FEHALO can be
               			calculated simply for any organic solvent.
               		
            
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