V1.8.1

Bug Fixes

• Arithmetic with constants and Spectrum1D now works in either order. [#964]

• Fixed uncertainty propagation in FluxConservingResampler. [#976]

V1.8.0

New Features

• Implemented uncertainty propagation for analysis functions. [#938, #939, #961, #968]

• Model fitting with fit_lines now returns uncertainties from the underlying scipy
  fitter by default. [#962]

Bug Fixes

• Fixed a bug with moment map orders greater than 1 not being able to handle
  cubes with non-square spatial dimensions. [#970]

• Added a workaround for reading JWST IFUs with incorrect GWCS. [#973]

Other Changes and Additions

• The Spectrum1D redshift and radial_velocity attribute setters were deprecated
  in favor of the more explicit set_redshift_to, shift_spectrum_to, and
  set_radial_velocity_to methods. [#946, #943]

• estimate_line_parameters now calculates estimates based on the selected
  region, rather than the entire spectrum. [#962]

V1.7.0

Bug Fixes

• Fixed spectral_slab crashing when spectral_axis has unit of pixels and
  the bounds are also defined in the unit of pixels. [#926]

• Fixed resulting spectral_axis containing NaN when a cube is passed into
  Spectrum1D without WCS nor spectral axis and the spatial-spatial dimension
  is smaller than spectral dimension. [#926]

• Fixed WCS not accurately reflecting the updated spectral axis after slicing a
  Spectrum1D. [#918]

Other Changes and Additions

• Logger usage is removed. Warnings now issued using Python warnings module.
  This enables more granular warning control for downstream packages. [#922]

V1.6.0

New Features

• Added collapse methods to Spectrum1D (mean, median, max, min, sum). [#904, #906]

• SpectralRegion and Spectrum1D now allow descending (in wavelength space) as
  well as ascending spectral values. [#911]

V1.5.0

New Features
^^^^^^^^^^^^

• Convolution-based smoothing will now apply a 1D kernel to multi-dimensional fluxes
  by convolving along the spectral axis only, rather than raising an error. [#885]

• template_comparison now handles astropy.nddata.Variance and
  astropy.nddata.InverseVariance uncertainties instead of assuming
  the uncertainty is standard deviation. [#899]

Bug Fixes
^^^^^^^^^

• Speed up JWST s3d loader and reduce memory usage. [#874]

• SpectralRegion can now handle pixels. [#886]

• Fix bug where template_comparison would return the wrong chi2 value. [#872]

Other Changes and Additions
^^^^^^^^^^^^^^^^^^^^^^^^^^^

• fit_lines now makes use of unit support in astropy.modeling. [#891]

• Spectrum1D.with_spectral_units now attempts to fall back on the spectral_axis
  units if units could not be retrieved from the WCS. [#892]

• ndcube package pin updated to released version (2.0). [#897]

• Minor changes for astropy 5.0 compatibility. [#895]

V1.4.1

Minor bugfix release, see changelog.

v1.4.0

See change log for list of new features and bug fixes.

v1.3.1

See change log for list of new features and bug fixes.

v1.3

See change log for list of new features and bug fixes.

v1.2

See change log for list of new features and bug fixes.