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Capital Sigma seems to be used in radio astronomy. eg A&A 376, 641 (2001): "radio surface brightness of Sigma < 2 x 10**22 Watt / m**2 / Hz / sr" Radio tends to use Jy/beam On Tue, 14 Dec 2004, Malcolm J. Currie wrote: > mu is certainly what's used in the optical. It's less confusing than it > might be; we don't have micromags per sq. arcsec. I can't say what is > used for other wavelength regimes. > > Malcolm > -- Tim Jenness JAC software http://www.jach.hawaii.edu/~timj