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REAL weight scaling factor for the generated visibilities.
It is a relative scaling factor in the weights compared to a supposedly optimal weighting to give the best combined synthesized beam. That optimal weighting essentially gives the same weight density par unit area in the UV plane than the shortest baselines measured with the interferometer only. However, if the single-dish data has not been observed long enough, or has baselines problems for example, this weight may add noise to the overall data set, so could be down-weighted.
Default: 1.0
See also SHORT_CHANNELS for other issues about noise estimate.