Your kind attention to prompt reply with highly valuable and nice comments is extremely appreciated, my nice friend.
I am going to study that part you kindly recommended and I will contact with you if any problem is again encountered.
Sincerely yours,
Saeed
AFAIK, atom contribution to BCP is not well-defined. The only possible way may be using source function, see Section "4.17.5 Study source function in AIM basins" in Multiwfn manual for example, but I am not sure if this method can meet you practical aim.
Best regards,
Tian
]]>Sincerely,
Saeed