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It can contain the following fields: <unit>
The parameters are as follows,
n - Name used to reference the field, especially when writing the .dat file.
pn - Label that will be visualized by the user. It can be translated.
default - Default unit for a specific magnitude..
SI_base -Unit based in the international system units for a specific magnitude.
active - It is the default unit shown in the user interface, for a specific magnitude.
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