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casangi / xradio

Xarray Radio Astronomy Data IO
https://xradio.readthedocs.io/en/latest/
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Deprecation of MSv2 `SIGMA` #317

Closed tnakazato closed 1 day ago

tnakazato commented 4 days ago

Just a question.

ALMA single dish pipeline has an usecase that utilizes noise rms of the spectral data after baseline subtraction as the basis of WEIGHT. Weights evaluated in this way should no longer be translated to SIGMA (it is mathematically possible but has no meaning, I think). Effectively original SIGMA value might be lost?

However, now I noticed that the original WEIGHT should be kept by the concept of data grouping. We should be able to restore original SIGMA values from WEIGHT values in the "base" group. Is my understanding correct?

Jan-Willem commented 4 days ago

Yes, that is correct.

tnakazato commented 1 day ago

Thanks!