###############################################################################
# This folder contains a copy of the SpectralQuantity and SpectralCoord classes
# from astropy core. If astropy>=4.1 is available, the SpectralCoord class is
# used directly from there, otherwise it is imported from the folder here. No
# changes should be made directly here, instead changes should be made to the
# core astropy package, and files copied back here. The only change that should
# be made is to change the import of SpectralQuantity from an absolute to a
# relative import.
#
# The license of the original code is:
#
# Copyright (c) 2011-2017, Astropy Developers
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification,
# are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this
#   list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice, this
#   list of conditions and the following disclaimer in the documentation and/or
#   other materials provided with the distribution.
# * Neither the name of the Astropy Team nor the names of its contributors may be
#   used to endorse or promote products derived from this software without
#   specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
###############################################################################

from distutils.version import LooseVersion

from astropy import __version__ as astropy_version

if LooseVersion(astropy_version) >= '4.1':
    from astropy.coordinates import SpectralCoord
else:
    from .spectral_coordinate import SpectralCoord

__all__ = ['SpectralCoord']
