1 GRID_EXTEND
        GRID_EXTEND

    This task makes a cube from  a  table   containing  irregularly  sampled
    data.   The data is interpolated/extrapolated using a convolution taking
    into account the beam size of the observing telescope.

    In mode NATURAL,  a  convolution  kernel  is  used  to  interpolate  the
    irregularly sampled data using the weight of each individual point.

    In mode UNIFORM, the same convolution process is used but the individual
    points are assumed to have equal weight.

    The pixel size is specified by the user, but the map size is  determined
    by  the task.  The input  table can be created by command GRID in CLASS,
    or using task TABLE from a formatted file.

2 TABLE$
        TASK\CHARACTER "Input TABLE name" TABLE$

    Specify the name of the input table.

2 MAP$
        TASK\CHARACTER "Output MAP name" MAP$

    Specify the name of the output map. The output map will be in VLM  order
    (Velocity, X coordinate, Y coordinate).

2 XCOL$
        TASK\INTEGER "Column of X coordinates" XCOL$

    Specify the column of the table containing the X coordinates

2 YCOL$
        TASK\INTEGER "Column of Y coordinates" YCOL$

    Specify the column of the table containing the Y coordinates

2 WCOL$
        TASK\INTEGER "Column for weights" WCOL$

    Specify the column containing the weights

2 MCOL$
        TASK\INTEGER "First and last column to grid" MCOL$[2]

    Specify the first and last column to be regridded. Note that the  weight
    column  can  be  included  in order to produce a weight image.  This can
    allow further processing based on Signal-to-Noise ratio.

2 WEIGHT_MODE$
        TASK\CHARACTER "Gridding Mode (NAtural or UNiform)" WEIGHT_MODE$

    Indicate the weight mode. NATURAL indicates a  convolution  with  proper
    weighting, UNIFORM a convolution without weighting.

2 TOLE$
        TASK\REAL "X-Y position tolerance" TOLE$

    Positional tolerance. Points separated less than TOLE$  (on  each  axis)
    are added together before resampling.

2 BEAM$
        TASK\REAL "Primary Beam Size" BEAM$

    Size of the beam used to obtain the data (in user units, not in pixels)

2 SPACING$
        TASK\REAL "Pixel separation" SPACING$

    Desired pixel size in user units.

1 END



























































