; UVBOX
;---------------------------------------------------------------
;! radius of the smoothing box used for uniform weighting
;# ADVERB UV IMAGING
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;---------------------------------------------------------------
UVBOX     LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC
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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
Procedures:
   CXPOLN........Procedure to make complex polarization images and beam.
   LINIMAGE......Build image cube from multi-IF data set.
Tasks:
   IMAGR.........Wide-field and/or wide-frequency Cleaning / imaging task.
   SCIMG.........Full-featured imaging plus self-calibration loop with
                 editing.
   SCMAP.........Imaging plus self-calibration loop with editing.
   SDIMG.........Task to select and image random-position single-dish
                 data.
   UVMAP.........Makes images from calibrated UV data.
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