AIPS HELP file for DEFER in 31DEC19
As of Tue Dec 11 22:47:34 2018
Type: Adverb (Real)
Use: Controls when someoperation such as file creation is actually
done. Normally, AIPS tasks create all output files at the
beginning along with any needed scratch files. This insures
that adequate disk space is available. However, when it is not,
it is sometimes possible to reduce the overall disk requirement
of a task by deferring some of the file creation until some of
the scratch files may be deleted.
UVSRT.....Sort a UV dataset into a specified order
DEFER > 0 specifies that the output file is created only
after one of the two scratch files may be deleted.