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Tessero\Interpolate\LinearNDInterpolator

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__construct 
__construct(array $points, array $values, float $fillValue = NAN, bool $rescale = false)

before triangulating, as SciPy's rescale=True does

query 
query(array $xi): array

Piecewise-linear value(s) at the query point(s). Points outside the convex hull yield the fill value (NaN by default), scalar or broadcast across all components for vector-valued data.