Keywords: class-weighting

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# Consequences

For all versions of GILDAS between oct19 and feb21

- Summing, averaging, or stitching spectra whose observing mode is either position switching, wobbler switching, or unfolded frequency switching gives the expected output spectrum.
- Summing, averaging, or stitching folded frequency switching spectra could lead to slightly incorrect noise estimations in some specific conditions.
  - If the user is summing, averaging, or stitching all the spectra in a single command, the output spectrum intensities and their associated noise level are behaving as expected.
  - Only when the user is summing, averaging, or stitching folded frequency switching spectra in subsequent calls to the `AVERAGE`, `ACCUMULATE`, or `STITCH` commands would lead to incorrect noise levels. The shape of the line is nevertheless preserved.