AIPS HELP file for CALSOUR in 31DEC18
As of Sat Jul 21 20:54:37 2018
Type: Adverb (String*16, 30 elements)
Use: Standard data selection adverb, used to specify a list of
calibrators to be included in or excluded from an
operation. If the first character of ANY element is "-"
then all named calibrators are excluded else all named
are included. All must be left justified. All blanks
mean all calibrators are selected.
Null Value: ' '
All null value usually means take all calibrators; null
values after a non null value are ignored.