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These data are part of a joint Australia Telescope National
Facility (ATNF) and U.S. Naval Observatory (USNO) program to extend
and maintain the International Celestial Reference Frame in the
Southern Hemisphere. The goal of the program is to image all such
sources at milliarcsecond resolution in order to determine their
continued suitability for reference frame use based on intrinsic
structure.
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Available items include PostScript format contour plots of
International Celestial Reference Frame source images at a radio
frequency of 8.4 GHz. Plots of visibility data in PostScript
format are also available. If you make use of these data in any
publication, please refer to the citation instructions.
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