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Yep, page 173 in the 4th edition and probably somewhere nearby in the earlier editions. Unfortunately it doesn't tell if the sides taper in as well. The problem isn't as much flow separation if the roof to trunl angle gets too steep, it's more that drag will go up even though (or more accurately, because) the air is following the surface, since as the angle goes up (assuming the flow doesn't separate) the rotors caused by air spilling over the sides overpowers the savings gained by filling in the space behind the car.
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