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The option is used to declare if the initial and final state are color singlet.
It is not color singlet in some calculation, and it is color singlet in other
case. The default value of it is zero which means the initial and final state
are color singlet. The user can set it to 1 to indicat that the initial and
final state is not color singlet by adding the line as
ncolor:='1\$
wang jian xiong
2003-01-10