Basic Information on pcsub

Task: pcsub
Purpose: Subtract a plane (optional by polynomial fit) from a cube
Categories: map combination

PCSUB (Polynomial Continuum Subtraction) is a MIRIAD task which
submits selected planes of a cube to a polynomial least squares
fit to make a continuum map that can be subtracted from the input 
cube. Optionally, if a continuum map is already known, this can
be subtracted also.

Key: in
The input image dataset. No default.

Key: out
The output image. For default see cont= keyword.

Key: order
The order of the highest term of the polynomial fit. 
Default is 0, i.e. a constant.

Key: region
Specify the channels to fit with a command of the region
of interest format, e.g. 
     region=image(1,5),image(120,128)
This would fit and subtract channels 1:5 and 120:128 from the
cube.  Note that blanked planes are correctly ignored, but
isolated blanked pixels in a plane are not.

Key: cont
If ``out'' is provided, the continuum is generated from the
region (channels) selected.  This continuum (cont=) is subtracted from
each of the channels of the cube (in=) to yield an output cube (out=)
If ``out'' alone is provided, this is all that occurs.  
If ``cont'' is also provided, the continuum map is also written to 
the file specified, if that file did not exist yet.
If ``cont'' did already exist, it is assumed to be the continuum map,
and subtracted from the input cube. 
If ``cont'' alone is provided, ONLY the continuum map is written, no
output cube is written.

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