Those numbers match what I've seen for the first gen. The ZX4 aero must be close enough for rounding because I've seen both .31 and .32 used on different sites. Or possibly some confusion with the second gen.
I don't know the exact angles but I believe the longer body on the wagon has better attached flow and the abrupt end actually help it compared to the ZX3.
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-Allch Chcar
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