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Damo,
Leave ICNR off and take dedicated dark frames. You'll thank me later.
Also, take dark frames for your flat frames, too.
As for bias/offset frames, some people use them. I have found that they introduce noise into my final composite, so, don't use them. Furthermore, your bias noise should be contained within your dark frames, as well as flat darks.
I guess it all depends on how critical you are and what your expectations are.
Regards,
Humayun
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