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SigFig is an Excel add-in. At the heart of SigFig is an algorithm that determines the exact digital (base 10) representation of any double precision (8 byte) number. Endowed with this capability, SigFig has been configured to do a variety of things:
(1) It displays numbers in engineering format, with powers of 10 as multiples of 3.
(2) It gives various digit grouping options. For example, 1.234567 can be depicted as 1. 234 567.
(3) It can round numbers off to between 3 and 17 significant figures. Note that 17 significant figures is required to uniquely identify a specific double precision value.
(4) It promotes, but does not require, the practice of entering numbers as character strings (with an essentially unlimited
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