MIT License

Copyright (c) 2020 Johannes Bühl, Martin Radenz, Willi Schimmel, Teresa Vogl

Permission is hereby granted, free of charge, to any person obtaining a copy
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in the Software without restriction, including without limitation the rights
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The function spec2mom_limrad94.estimate_noise_hs74_fast are taken from the pyART package 
(https://github.com/ARM-DOE/pyart/blob/master/pyart/util/hildebrand_sekhon.py) with following license:

Copyright 2013 UChicago Argonne, LLC. This software was produced under U.S. 
Government contract DE-AC02-06CH11357 for Argonne National Laboratory (ANL),
which is operated by UChicago Argonne, LLC for the U.S. Department of Energy.
The U.S. Government has rights to use, reproduce, and distribute this
software.  NEITHER THE GOVERNMENT NOR UCHICAGO ARGONNE, LLC MAKES ANY 
WARRANTY, EXPRESS OR IMPLIED, OR ASSUMES ANY LIABILITY FOR THE USE OF THIS
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software should be clearly marked, so as not to confuse it with the version
available from ANL.
 
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    * Neither the name of UChicago Argonne, LLC, Argonne National
      Laboratory, ANL, the U.S. Government, nor the names of its 
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      from this software without specific prior written permission.

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