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2. VLA observations

The VLA (Thompson et al. 1980) A-array observations were made in the X (8.4 GHz) and U (15 GHz) bands on 1990 September 10. The data were calibrated in the standard way using VLA calibrators and AIPS procedures. More detailed information on the data analysis can be found in Mantovani et al. (1994). Observations of the same sample of sources were done earlier at 5 GHz with the VLA A-array in 1986 May 30 (Mantovani et al. 1992). However, the polarization data were not presented earlier and are listed here along with the values at the higher frequencies.

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