IUE spectra can be combined to increase the signal to noise ratio. The procedure COADD will perform coaddition. The files used as input do not have to have identical wavelengths; COADD will resample any spectra that do not match the FIRST spectra entered.
|SPEC||The number of spectra to be coadded or a string array of filenames. You may also enter an argument for FINDFILE (e.g., 'SWP*.SAV'). If SPEC=0, the user is prompted for input.|
|ELIM||Possible values are:
Cutoff value for weighting. Only points >ELIM will be considered good data. IUESIPS only.
The specified bit setting(s) of () will be considered bad. You may use the procedure NUFLAGS to generate a value for ELIM. NEWSIPS only.
0 The user is prompted for input.
>0 All points are included.
|WOPT||Exposure weighting option:
0 Prompt user for input.
1 Use SQRT(exposure time) for weighting.
2 Use exposure time for weighting.
3 Uniform weighting of spectra.
4 Prompt user for constant weight for each spectrum.
5 NEWSIPS only: use values. Will not work if wavelengths are interpolated.
|CNAME||Name of output file (less than 8 characters). If CNAME=' ', the user is prompted for the name.|
|newsips||If SPEC is a number, COADD will assume that input files are IUESIPS RDAF.SAV files unless this keyword is set.|