The POLYNOMIAL structure is used for storing the coefficients of an -dimensional ordinary or Chebyshev polynomial, or the coefficients of a cubic B-spline. The value of the [VARIANT] component defines which of these types of polynomial is stored. Evaluation of the polynomial yields a float scalar result.
In the following descriptions NAXIS is the dimensionality of the [DATA_ARRAY] and therefore the dimensionality of the space over which the polynomial function is defined.
Starlink Standard Data Structures