code: def register_wcs(name, wrapper_class, coord_types):
      
      global custom_wcs
      custom_wcs[name] = Bunch.Bunch(name=name,
                                     wrapper_class=wrapper_class,
                                     coord_types=coord_types)
docs: Register a custom WCS wrapper.
  
      Parameters
      ----------
      name : str
          The name of the custom WCS wrapper
  
      wrapper_class : subclass of `~ginga.util.wcsmod.BaseWCS`
          The class implementing the WCS wrapper
  
      coord_types : list of str
          List of names of coordinate types supported by the WCS