[argyllcms] Printtarg Options

Hi,
Could someone enlighten me on the -kg, -kc, -ks and -kn options for printtarg?
I am assuming they specify black generation of the target files.
Should numbers follow any of these options to control their results?
I'm asking because of the comment: "a Black separation color can be specified(-ks)"

Would this look something like:. -ks 0 85 55 100 ?

Many thanks,
Mike

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