It's a logarithmic curve. A different example:

The upper extent isn't adding much.
The ultimate example is the Maclaren T50
www.slashgear.com/gordon-murray-automotive-t50-supercar-ground-effect-fancar-revealed-10602788
It's so steep there is probably recirculation in the top. Until the fan cuts in and pulls the airflow up.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.tragectory: Line goes down and to the right.
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