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"Aerodynamics of Road Vehicles" 5th Ed. copyright is 2016. The graph is cited from an article by W. A. Mair in 1978. The transition to the taper cannot be abrupt as in the "ice cream cone" profile. The article points out that many cars use a 10 degree taper to good effect as in the tests done using the Mercedes Benz C111. So yes, an exponential curve is better than lopping off at a given angle.
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