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Basic Information on oldflux
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
Reynold's 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 used. 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.
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