Abstract
VLBI observations at wavelengths of 18 and 6 cm with baselines up to 15 and 23 million wavelengths have been made in a search for structures on scales of 10 to 100 milliarcseconds (mas) in the quasar 4C 39.25. No significant structure on these scales above 5% of the peak brightness was detected. The core itself, however, appears to be extended on a scale of 2 to 4 mas and to have a variable flux.
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