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millibarns is a unit of cross-section for collisions in particle physics. MetPy caters to meteorologists, who would normally interpret 'mb' to be millibars, a unit of pressure.

GregZ
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  • It's not clear to me what you're asking, but this might be better addressed to https://github.com/Unidata/MetPy – jonrsharpe Feb 01 '19 at 16:35

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MetPy's unit support is handled by the pint library, which dictates what can be used. According to the wikipedia article on the bar unit, the use of the "b" abbreviation for bar is deprecated due to the confusion with barne.

DopplerShift
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