sumspec combines
extracted
1-d or 2-d spectrum files. The output spectra are a straight sum of the
input
spectra. CR rejection can be applied to 2-d files if there are multiple
input files. The output file format is the same as the input format, as
described in the documentation for extract-2dspec.
USAGE
sumspec -o outfile infiles
INPUT
infiles is a list of
input
files root names (e.g. ccdnnnn)
OUTPUT
outfile is the name
of
the new file created. It must end in _1spec or _2spec
PARAMETERS
clean
remove cosmic rays?
siglimit
CR rejection threshold in
units of sigma
Details:
Unless cosmic ray rejection is requested, sumspec simply sums the
intensity values from each file. If the input files contain a second
plane with error data, the error values are combined appropriately. If
CR rejection is requested (2-d data only), the data are first scaled by
exposure time, then summed and data points more than siglimit higher
than the mean given zero weight, after which a final sum is made.
CR rejection requires input data produced with newer versions of COSMOS
which include the exposure time.
The spectrum files to be summed must match identically: data sampling
and object list. To ensure this, the extraction of all spectrum files
should start with the same initial map file, created with map-spectra.
(The final map files will differ slightly, of course, since each will
have been modified using adjust-map and a different comparison arc.)