https://github.com/mcvine/instruments/blob/f2f7831d7dbbdd01007f0aab739803dc166abab3/CNCS/CNCS/beam_postprocessing.py#L127 https://github.com/mcvine/instruments/blob/f2f7831d7dbbdd01007f0aab739803dc166abab3/CNCS/CNCS/beam_postprocessing.py#L130