### Note:

(1-12) will also work but (1e-12) will cause a strange problem having to do with the fact that e is an electronic charge of 1.602192e-19 coulomb. This is shameful but everywhere else (1e12) is treated as a number except when it appears in a units combination. ie (1e-6 m) must be written (1-6 m) or (micro m) or (micro-m). The rule is that the UNITS block uses the unix units program syntax exclusively but there exists a (1e12) convenience exception outside the UNITS block.

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