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In August 1994, the nominal flux density of the ATCA's primary flux
calibrator, 1934-638, was revised to give better agreement between
the ATCA's flux density scale and the flux scales used in the northern
hemisphere (the VLA in particular). For more discussion, see John
Reynolds' memo ``A revised flux scale for the AT Compact Array''.
This introduces a problem when mixing data (either combining or
just comparing) calibrated before and after this change. By default
MIRIAD
tasks use the new flux scale. However if you use the option
`oldflux' in gpcal
and mfcal
when calibrating 1934-638,
the old flux scale will be propogated to the calibrated data.
In this way, new data can be calibrated
to have the old flux scale, and so can be combined/compared
directly with data calibrated before the revision.
Last generated by rsault@atnf.csiro.au on 16 Jan 1996