^ true for the edges on the surface of the trunk, but at the tip of the trunk when the air finally separates on the car should be sharp edges like in his pic for clean separation from the car.
Also, like he said, the trunk angle might be too steep. you might be able to get it to end at the license plate the same way, however, if you start at the windshield angle and gradually decrease at a rate of 13 degrees. It'd be better than having a straight angle from the windshield.
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