Continuum

In PySME, the continuum level of the synthetic spectrum can be adjusted to match the observed spectrum using cscale and cscale_flag.

• cscale: Polynomial coefficients (per segment) applied to the synthetic spectrum. The polynomial is evaluated on the observed wavelength grid after shifting the first point to zero, i.e., f(wave - wave[0]).

• cscale_flag: Controls whether and how continuum correction is applied.

  • none: No continuum correction.

  • fix: Use the current cscale values without updating them.

  • constant: Scale by a constant factor.

  • linear: First-order polynomial (straight line).

  • quadratic: Second-order polynomial.