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Does the figure in the OP's link remind anybody of a Saab 900 ?
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now you mention it, however the saab 900 actually wasn't so aero as veryone wants to believe it's cd was around 0.40 if i remember correctly... the big whale spoiler helped a lot to improve that though.
a rather square body with this saab like rear angle is know as a morell body, i don't have much info on it, but basically the sides act like two vortex generators wich produce two large counter rotating vortices... this is quite bad for aero.
this body style was quite comming in the 70's and 80's and you frequently see these cars have spoilers installed below the windshield to reduce the size of the vortex... usually the Cd numbers of car with and without the spoiler are vastly appart .