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% @(#)backgrfero.hlq 19.1 (ESO-IPG) 02/25/03 14:20:54
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% @(#)backgndfero.hlq (ESO-IPG) 12-11-1997
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%++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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%.COPYRIGHT (c) 1997 European Southern Observatory
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%.AUTHOR AM, LSW Heidelberg, IPG/ESO
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%.KEYWORDS MIDAS, help files, BACKGR/FEROS
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%.PURPOSE On-line help file for the command: BACKGR/FEROS
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%.VERSION 1.0 12-NOV-97 : Creation, AM
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%----------------------------------------------------------------
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BACKGR/FEROS 23-FEB-99 AM/OS
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BACKGR/FEROS [rawimage] [flatimage] [centertable] [bgmode]
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[bgparams] [medianfltsz] [fiber_mode]
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Determine (and subtract) background from echelle spectrum
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Determine (and subtract) background from echelle spectrum
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BACKGR/FEROS [rawimage] [flatimage] [centertable] [bgmode]
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[bgparams] [medianfltsz] [fiber_mode]
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rawimage = name of input image
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flatimage = name of output image
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centertable = name of table with polynomial coefficients for
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bgmode = background mode
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B for subtract background (default),
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N for compute background only
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bgparams = bg_step_x,bg_step_y,bg_width_x,bg_width_y,fitdeg
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parameters for background determination
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bg_step_x, bg_step_y = step size for background
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determination in x and y direction
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bg_width_x, bg_width_y = window size for background
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determination in x and y direction
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bgdist = minimum distance between orders
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medianfltsz = bg_median_x,bg_median_y
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size of median filter in x and y direction
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\ap\pa fiber_mode = 1 or 2.
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For 2-fiber mode (FEROS mode), the background is also
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determined between the two fibers!
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centertable must exist. It can be created using DEFINE/FEROS.
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BACKGR/FEROS rawspectrum flatspectrum
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Subtract background from image named rawspectrum and write
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data to image named flatspectrum using default parameters.
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BACKGR/FEROS rawspectrum flatspectrum ? B ? 4,8
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Subtract background (no flatfield normalization) from image
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named rawspectrum and write data to image named flatspectrum.
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Use a median filter of 4 pixels width and 8 pixels height and
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default values for centertable and bgparams.