This is the additional/replacement parameter set for SPC/E water
MASS
ca    12.0  0.360
 
BOND
ca-ca  938.0    1.4000      SPC/E water
 
ANGLE
ca-ca-ca  126  120

DIHE
X -ca-ca-X    4   14.500       180.000           2.000      intrpol.bsd.on C6H6

NONBON
ca       1.9 0.0860