... to1
It should be noted that in response to numerous comments from the FITS community, the guidelines outlined here differ significantly from those given in all version of this memo prior to 1993 May 11
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... quantity2
Note that the IAU has ruled that a second of time should NOT be abbreviated to sec; the string sec should NOT therefore be used to specify such a quantity within a FITS file.
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... formed3
The only exception is kilogram (kg) which represents $10^3$ grammes. Multiples & submultiples of mass should therefore therefore adhere to the above rules, but using grammes, with the unit string g, as a base (hence $10^9$ kilogram denoted by Tg, $10^{-15}$ kilogram by pg etc. ). The use of grammes (g) as a unit is of course also allowed.
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