- Update to 1.4.0 
  New Features
  * photutils.aperture
    * Added a copy method to Aperture objects. [#1304]
    * Added the ability to compare Aperture objects for equality.
      [#1304]
    * The theta keyword for EllipticalAperture, EllipticalAnnulus,
      RectangularAperture, and RectangularEllipse can now be an
      Astropy Angle or Quantity in angular units. [#1308]
    * Added an ApertureStats class for computing statistics of
      unmasked pixels within an aperture. [#1309, #1314, #1315,
      #1318]
    * Added a dtype keyword to the ApertureMask to_image method.
      [#1320]
  * photutils.background
    * Added an alpha keyword to the Background2D.plot_meshes
      method. [#1286]
    * Added a clip keyword to the BkgZoomInterpolator class.
      [#1324]
  * photutils.segmentation
    * Added SegmentationImage cmap attribute containing a default
      colormap. [#1319]
    * Improved the performance of SegmentationImage and
      SourceCatalog, especially for large data arrays. [#1320]
    * Added a convolved_data keyword to SourceCatalog. This is
      recommended instead of using the kernel keyword. [#1321]
  Bug Fixes
  * photutils.aperture
    * Fixed a bug in aperture_photometry where an error was not
      raised if the data and error arrays have different units.
      [#1285].
  * photutils.background
    * Fixed a bug in Background2D where using the pad edge method
      would result in incorrect image padding if only one of the
      axes needed padding. [#1292]
  * photutils.centroid
    * Fixed a bug in centroid_sources where setting error, xpeak,
      or ypeak to None would result in an error. [#1297]
    * Fixed a bug in centroid_quadratic where inputting a mask
      would alter the input data array. [#1317]
  * photutils.segmentation
    * Fixed a bug in SourceCatalog where a UFuncTypeError would be
      raised if the input data had an integer dtype [#1312].
  API Changes
  * photutils.aperture
    * A ValueError is now raised if non-positive sizes are input to
      sky-based apertures. [#1295]
    * The BoundingBox.plot() method now returns a
      matplotlib.patches.Patch object. [#1305]
    * Inputting PixelAperture positions as an Astropy Quantity in
      pixel units is deprecated. [#1310]
    * Inputting SkyAperture shape parameters as an Astropy Quantity
      in pixel units is deprecated. [#1310]
  * photutils.background
    * Removed the deprecated background_mesh_ma and
      background_rms_mesh_ma Background2D properties. [#1280]
    * By default, BkgZoomInterpolator uses clip=True to prevent the
      interpolation from producing values outside the given input
      range. If backwards-compatiblity is needed with older
      Photutils versions, set clip=False. [#1324]
  * photutils.centroid
    * Removed the deprecated centroid_epsf and gaussian1d_moments
      functions. [#1280]
    * Importing tools from the centroids subpackage now requires
      including the subpackage name. [#1280]
  * photutils.morphology
    * Importing tools from the morphology subpackage now requires
      including the subpackage name. [#1280]
  * photutils.segmentation
    * Removed the deprecated source_properties function and the
      SourceProperties and LegacySourceCatalog classes. [#1280]
    * Removed the deprecated the filter_kernel keyword in the
      detect_sources, deblend_sources, and make_source_mask
      functions. [#1280]
    * A TypeError is raised if the input array to SegmentationImage
      does not have integer type. [#1319]
    * A SegmentationImage may contain an array of all zeros.
      [#1319]
    * Deprecated the mask_value keyword in detect_threshold. Use
      the mask keyword instead. [#1322]
    * Deprecated the filter_fwhm and filter_size keywords in
      make_source_mask. Use the kernel keyword instead. [#1322]

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