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Return the rms noise in the specified VarNoise SIC real scalar variable. The rms noise is also available in variable STAT_NOISE, and if the image is the CLEAN (resp. SKY) image, in CLEAN%NOISE (SKY%NOISE) as well for further convenience and use in scripts.
Keyword ONLY is reserved for specific internal use: it instructs STATISTIC command to only use the simple rms derivation on SKY images, rather than the more elaborate fitting of the intensity distribution.