class_docstr: The frequency quadruple side band class.
  
  The elements of the quadruple-side-band type frequency band are the
  central frquency, the relative (main) side band frequency (relative to the
  center - left and right), the sub-side band frequency (relative to the
  offset side-band(s)) and their bandwidths. Optionally a unit (defaults to
  GHz) may be specified. No clever unit conversion is done here, it's just
  used for checking that two ranges are comparable.
  
  Frequency Quadruple Side Band is supposed to describe the special type of
  bands commonly used in temperature 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. But to avoid (CO2) absorption lines
  symmetrically positioned on each side of the main absorption band it is
  common to split the side bands in two 'side-side' bands.
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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 FrequencyQuadrupleSideBand obj's underlying member method code with example usage: obj.__hash__() and returns: tuple