AIPS HELP file for UVBOX in 31DEC09

As of Sun Nov 22 16:50:49 2009

HELP SECTION

UVBOX
Type: Adverb   (Real)
Use: The radius in cells of the smoothing box used for uniform
     weighting.  All visibilities within a box of this radius of
     a given visibility will be used to compute the weight if
     uniform weighting was specified.

     For example, UVBOX=0 means that a visibility weight is
     determined from the number of visibilities occuring in
     the same cell.  UVBOX=1 uses the number of visibilities
     occuring in the 9 cells centered on the cell in which the
     visibility in question occurs; UVBOX=2 uses 25 cells etc.
     The actual weight counted depends on the UVBXFN - the
     weight can be counted fully or reduced by some function as
     it gets farther from the cell on which it is centered.  The
     size of the cells in the UV plane is set by
             1 / (CELLSIZE(i) * UVSIZE(i))
     with some correction for units.
Null value:   0 => just use the cell in which the data sample
     occurs for weighting
Tasks: several soon to be obsolete tasks, plus
  IMAGR.....Fourier transform and Clean UV data with a full
            range of calibration, weighting, Cleaning, and
            wide-field correction options.

EXPLAIN SECTION