The practical meaning of the throw heights 0, 1, and 2 in the
standard model requires a little thought.
A throw height of 0 corresponds to an empty hand.
A throw height of 1 corresponds to a rapid shower pass from
one hand to another that is thrown again immediately.
A throw height of 2 would ordinarily
indicate a very low throw from a hand to itself that is thrown
again by that hand immediately. This is actually rather
unnatural in practice; the conventional interpretation
([11], [12]) is that a throw height
of 2 is a held ball.
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