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Mathematical Curve (B‑spline)
Derived from the traced CSV
points by fitting a cubic B‑spline x(t), y(t). Download JSON to view knots and
coefficients
for verification and digitization
Parametric form per interval [ti,
ti+1]:
x(t) = axi + bxiτ + cxiτ² + dxiτ³;
y(t) = ayi + byiτ + cyiτ² + dyiτ³ (τ = t −
ti)