class_docstr: The frequency double side band class.
  
  The elements of the double-side-band type frequency band are the central
  frquency, the relative side band frequency (relative to the center - left
  and right) and their bandwidths, and optionally a unit (defaults to
  GHz). No clever unit conversion is done here, it's just used for checking
  that two ranges are comparable.
  
  Frequency Double Side Band is supposed to describe the special type of bands
  commonly used in humidty sounding from Passive Microwave Sensors. When the
  absorption band being observed is symmetrical it is advantageous (giving
  better NeDT) to sense in a band both right and left of the central
  absorption frequency.
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docstr: Hash this tuple.
docstr_tok: ["Hash","this","tuple","."]
code: def __hash__(self):
      """Hash this tuple."""
      return tuple.__hash__(self)
  
imports: import numbers
  from contextlib import suppress
  from typing import NamedTuple
  import numpy
label_desc: Use image node_id 3 for calling the FrequencyDoubleSideBand obj's underlying member method code with example usage: obj.__hash__() and returns: tuple