kinextract.fh4_fortran_like

kinextract.fh4_fortran_like(w: ndarray) → ndarray

Fourth-order Gauss-Hermite basis polynomial, legacy Fortran normalization.

Evaluates the h4 basis function used by the original Fortran pipeline (pallmc.f-style convention). See fh3_fortran_like() for the companion h3 term and a note on the normalization convention; this fortran convention differs numerically from the van der Marel & Franx (1993) polynomials used by gauss_hermite_losvd_model_ho().

Parameters:

w (ndarray) – Standardized velocity, w = (v - V) / sigma (dimensionless).

Returns:

Value of the fortran-convention H4 basis polynomial at each w.

Return type:

ndarray