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I can't seem to find the quotient required to approximate the third order greeks
Speed, Zomma, Color and Ultima

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For first order accuracy you can use:

$f^3(x)=\frac{1}{h^3}\left(f(x+2h)-3f(x+h)+3f(x)-f(x-h) \right)$

For the second order accuracy:

$f^3(x)=\frac{1}{2h^3}\left(f(x+2h)-2f(x+h)+2f(x-h)-f(x-2h) \right)$

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