Piecewise-constant chromatic variations (CMX)

CHANGELOG-unreleased.md

@@ -16,6 +16,7 @@ the released changes.
 - Added an option `linearize_model` to speed up the photon phases calculation within `event_optimize` through the designmatrix.
 - Added AIC and BIC calculation to be written in the post fit parfile from `event_optimize`
 - When TCB->TDB conversion info is missing, will print parameter name
+- Piecewise-constant model for chromatic variations (CMX)
 - `add_param` returns the name of the parameter (useful for numbered parameters)
 ### Fixed
 - Changed WAVE_OM units from 1/d to rad/d.

src/pint/models/__init__.py

@@ -25,7 +25,7 @@
 from pint.models.binary_dd import BinaryDD, BinaryDDS, BinaryDDGR, BinaryDDH
 from pint.models.binary_ddk import BinaryDDK
 from pint.models.binary_ell1 import BinaryELL1, BinaryELL1H, BinaryELL1k
-from pint.models.chromatic_model import ChromaticCM
+from pint.models.chromatic_model import ChromaticCM, ChromaticCMX
 from pint.models.cmwavex import CMWaveX
 from pint.models.dispersion_model import (
     DispersionDM,