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FindGraph uses parametric equations X(u), Y(u) to fit data with closed curves.

X(U) = X_{0} + A_{1}*sin(U)+...+A_{n}*cos(n*U) 

Y(U) = Y_{0} + B_{1}*sin(U)+...+D_{n}*cos(n*U). 

Center point X_{0},Y_{0} and
the parameters A_{j}, B_{j}, C_{j}, D_{j}
are estimated by the method of leastsquares
to minimize the difference between the model and data.

If the number of harmonics N = 1, we find ellipse.
The Bspline estimation options include a pure interpolation and a least squares curve approximation.
The derivatives are available. 

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