1 UV_STAT
        UV_STAT :  Analyse a UV table for weighting parameters and map  cell
    size.

    UV_STAT analyses a UV table from the weighting point of view to evaluate
    the  beam  size  and  the  expected  rms  noise as function of Weighting
    parameters (UV_CELL, mode  WEIGHT)  or  Taper  (UV_TAPER,  mode  TAPER).
    UV_STAT  computes  dirty  beams for various tapers or "Robust weighting"
    parameters, and evaluate the expected rms noise for each of them.


2 UV_TABLE$
        TASK\FILE "UV table" UV_TABLE$

    The UV table name.  Default extension is .UVT.  This UV  table  will  be
    sorted if necessary.
2 UV_MODE$
        TASK\CHARACTER "Checking mode" UV_MODE$

    The checking mode can be TAPER or WEIGHT.

    If TAPER is selected, UV tapers ranging from 50 to 800 m (in  powers  of
    sqrt(2)) will be used to produce 10 different beams.  The weighting mode
    is then defined from parameter  UV_CELL.  If  UVCELL[2]  is  0,  natural
    weighting  is  used. If not, robust weighting over cell sizes UV_CELL[1]
    (default 7.5 m) with "Robust" parameter UV_CELL[2] will be used.

    If WEIGHT is selected, "Robust" weighting parameters ranging  from  0.03
    to  300  by factors sqrt(10) will be used to produce 10 different beams.
    The taper defined by UV_TAPER will be  used.  UV_CELL[1]  specifies  the
    cell size to define the robust weighting.

2 UV_TAPER$
        TASK\REAL "UV taper (maj, min, angle) " UV_TAPER$[3]

    The 2-dimensional UV taper: 1/e level along the major  axis,  1/e  level
    along the minor axis, position angle in degrees.
2 UV_CELL$
        TASK\REAL "UV cell(m), for unif.  weighting" UV_CELL$[2]

    UV_CELL[1] is the UV cell size for uniform/robust weighting.  Should  be
    of the order  of half the dish diameter, or smaller.

    UV_CELL[2]  is  the  "Robust"  weighting  parameter.  0  means   natural
    weighting. When non-zero, the "Robust" parameter refers to the threshold
    selected for uniform weighting.  1  gives  usually  reasonable  results.
    Smaller  parameters  produce  more  uniform weighting, but higher noise.
    Larger parameters produce larger beams,, but smaller noise.
2 DO_BEAMS$
        TASK\LOGICAL "Save beams on disk ?" DO_BEAMS$

    Logical flag to indicate whether the 10 computed beams should  be  saved
    or  not.  If YES, beams will be saved in a file with same name as the UV
    table and extension ".beams"
2 WCOL$
        TASK\INTEGER "Weight channel" WCOL$

    The channel from which the weight should be taken.  WCOL$ set to 0 means
    the central channel.
1 END






