.help extinct Apr85 noao.onedspec
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NAME
extinct -- Correct spectra for atmospheric extinction
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USAGE
extinct root records output
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PARAMETERS
.ls root
The root name for the input spectra to be corrected.
.le
.ls records
The range of spectra to be included in the extinction operation.
.le
.ls output
The root name for the output corrected spectra
.le
.ls start_rec
The starting record number for the output corrected spectra.
.le
.ls nr_aps = 2
The number of instrument apertures for this data set.
.le
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DESCRIPTION
The input spectra are corrected for atmospheric extinction. 
EXTINCT redirects the spectra through the task BSWITCH so all
procedures are identical to those described for that task.

Because BSWITCH attempts to perform a beam-switch operation
unless the subset parameter is equal to the number of
instrument apertures (in which case beam-switching degenerates
to a copy operation), the hidden parameter nr_aps should be set
appropriately to the instrument. For IIDS and IRS data, this
is 2.
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EXAMPLES

	cl> extinct  nite1 1001-1032 nite1ex
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BUGS
The input string of spectra must be ordered so that only
one spectrum from each aperture is present among substrings
of length nr_aps.
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SEE ALSO
bswitch
.endhelp