Task: pcsub Purpose: Subtract a plane (optional by polynomial fit) from a cube Categories: map combination PCSUB (Polynomial Continuum Subtraction) is a MIRIAD task that does a polynomial least squares fit to selected planes of a cube to make a continuum map that can be subtracted from the input cube. Alternatively, if a continuum map is already known, this can be subtracted. Limitations: 1) only designed for 3-D images 2) the region input parameter should be specified only with the IMAGE command, e.g., region=image(1,5),image(125,128) would average and subtract planes 1:5 and 125:128 any specified x-y sub-regions will be ignored 3) Blanked pixels in the image are only partially handled. If a plane is completely blank then it is ignored, however, a plane that is partially blanked is not dealt with. 4) No fit to a polynomial greater than 10 is permitted. 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. Revision: 1.5, 2013/08/30 01:49:21 UTC

Generated by miriad@atnf.csiro.au on 21 Jun 2016