New interpCode=6 for PiecewiseInterpolation: Multiplicative Polynominal Interpolation with Linear Extrapolation #16858
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ATLAS Higgs group has a need for interpCode 4 (poly interp with linear extrap) but in a multiplicative form rather than additive. The new interpCode 6 adds this option.
I also tried to update the documentation in PiecewiseInterpolation to explain all the interpcodes (I skipped interpCode 3 since it looks like its actually identical to interpCode 2 at the moment, and anyway I don't see it used in the wild atm).