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There is no way a spoiler in the middle of the hatch, below the window has any real function.
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why not?
i don't claim to have the answer to what if does, but here's another example.
the angle of the hatch is more close to what one would consider aerodynamic, but it still is far to steep to have any attached flow.
yet i think the sides are more important in this.... the airflow coming of the sides of a vehicles acts in complex ways with the airflow of the top. the sides of the swift in the original post seem rounded so they don't promote separation... the spoiler might interact in a positive way with this flow.