v1.10.0

New Features

• wcs1d-fits loader now reads and writes celestial components of
  of multi-dimensional WCS, and handles mask and uncertainty
  attributes. [#1009]

• Added support for reading from files with flux in counts. [#1018]

Bug Fixes

• Fixed SpectralAxis.with_observer_stationary_relative_to to actually
  return the updated spectral axis. [#992]

• Fixed region extraction for axes/regions in units of u.pix. [#1001]

• tabular-fits writer now properly converts uncertainties to StdDevUncertainty
  if needed. [#1027]

• Fix bug in fit_lines which gave unexpected outputs from the get_fit_info
  and ignore_units keyword arguments. [#1030]

• Fix SNR calculations with both masks and regions. [#1044]

Other Changes and Additions

• Added some basic documentation for Spectrum1D.write. [#1017]

• JWST s2d and s3d readers now requires the optional dependency, stdatamodels,
  which user has to install separately. [#1038]

• ASDF tag for Spectrum1D is now compatible with ASDF v3.
  As a result, minversion of asdf has been bumped to 2.14.
  Redundant ASDF schema for SpectralCoord is removed.
  It also now supports mask serialization. [#1042, #1053]

• JWST X1D reader will no longer raise a UnitWarning for surface brightness
  error. [#1050]