Defined to support storing and loading the spectrum descriptor to/from Streams.

TSpectrumDescriptorRecord = packed record
  SpectrumMethod: integer;
  Integration: integer;
  Logarithmic: integer;
  Averages: integer;
  AveragingType: integer;
  SamplingTime: double;
  SamplingFrequency: double;
  ArOrder: integer;
  Window: integer;
  ScaleFactor: double;
  SpectrumType: integer;
  SidelobeAtt: double;
  ActualZeroPadding: double;
end;