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centigram or centigramme is equal to 10-1 gram (unit of mass), comes from a combination of the metric prefix centi (c) with the gram (g). Plural name is centigrams.
Femtogram or femtogramme is equal to 10-15 gram (unit of mass), comes from a combination of the metric prefix femto (f) with the gram (g). Plural name is femtograms.