AIPS HELP file for NFIELD in 31DEC26

As of Tue Feb 10 1:41:13 2026

HELP SECTION

NFIELD
Type: Adverb   (Real)
Use:  The number of fields associated with a verb, task, or adverb.
      Up to 64 are allowed in normal imaging tasks without use of a
      BOXFILE.  IMAGR has a limit of 4096 with a BOXFILE.

      NFIELD is normally not used in the presence of a BOXFILE.
Null value:  0
      Null value is usually assigned 1.
Tasks:
   BOXES.........Adds Clean boxes to BOXFILE around sources from a list.
   CHKFC.........Makes images of Clean boxes from Boxfile.
   FILIT.........Interactive BOXFILE editing with facet images.
   FIXBX.........Converts a BOXFILE to another for input to IMAGR.
   FLATN.........Re-grid multiple fields into one image incl
                 sensitivity.  NFIELD is the maximum number of facets
                 per pointing.
   IMAGR.........Wide-field and/or wide-frequency Cleaning / imaging
                 task.
   SABOX.........Create box file from source islands in facet images.
   SCIMG.........Full-featured imaging plus self-calibration loop with
                 editing.
   SETFC.........Makes a BOXFILE for input to IMAGR.  NFIELD is an
                 output adverb.
Verbs:
   DFILEBOX......Verb to delete Clean boxes with TV cursor & write to
                 file.
   DRAWBOX.......Verb to draw Clean boxes on the display.  NFIELD is the
                 facet number to attach to the boxes.
   FILEBOX.......Verb to reset Clean boxes with TV cursor & write to
                 file.  NFIELD is the facet number to attach to the
                 boxes.
Procedures:
   LINIMAGE......Build image cube from multi-IF data set.  FLDSIZE
                 passed to IMAGR.
   PEELR.........Calibrates interfering sources in multi-facet imges.
   TDSTEP3.......Time-dependent imaging procedure "step 3"

EXPLAIN SECTION