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Numbers of 4 or More Digits to Either Side of the Decimal Point.
Edward H. Livingston
in AMA Manual of Style: A Guide for Authors and Editors (11th ed.)
Commas are not used in large numbers. In 4-digit numbers, the digits are set closed up. For numbers of 10 000 or greater, a thin space is used to separate every 3 digits starting from the right-most integer (or, in numbers with decimals, from the left of the decimal point). For numbers with 5 or more digits to the right of the decimal point, a thin space is used between every 3 digits starting from the right of the decimal point (...View:
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