The lateral speed looks like it should be of the general form:
Crosswind* [1 - exp( -x/Constant) ]
Where exp is the exponential function--the constant 'e' (~2.718281828) raised to the power of the expression in the parentheses.
'Constant' would be determined by the interaction of the bullet and the crosswind that turns the bullet.
'Crosswind' is the full crosswind value in mph.
'x' is the independent variable. Traditionally it would be time or distance.
It does come close to fitting, but doesn't quite work whether I make the independent variable 'x' distance or time of flight.
I suspect that 'Constant' isn't really a constant but probably varies based on bullet velocity and maybe other parameters.
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