The default number of coefficients to be used when fitting functions to the order trace.
The type of function to be used is set by the parameter TRCFIT. (Default value is POLY for polynomial.)
When TRCFIT=POLY then the number of coeffs should be set to degree of polynomial+1.
When TRCFIT=SPLINE the number of coeffs should be set to (number of knots+7)*2.
For example, setting TRC_NPOLY to 4 would permit the fitting of polynomials of the form:
constant + a.x + b.x-squared + c.x-cubed
INITIAL SUGGESTED VALUE: 4.
Martin Clayton