1 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 Weight‐
    ing  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  UV_CELL[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 weight‐
    ing. When non‐zero, the "Robust" parameter refers to the  threshold  se‐
    lected for uniform weighting. 1 gives usually reasonable results. Small‐
    er 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 ENDOFHELP








