Next: 10.6 Subtraction of the
Up: 10 Post-processing
Previous: 10.4 Co-adding repeated scans
The fitting of individual subspectra into one spectrum would involve
the following processing steps:
- Identify and mark (remove) bad data points in the subspectra.
- Compare the overlap regions of the spectra and normalize the
subspectra to a constant value or one subspectrum to a portion
of the the other subspectrum. (This might involve rebinning of spectra
and coadding or averaging of spectra).
- Join the spectra together in one spectrum by averaging the overlap
regions.
No guidelines can be given which detector is to be used as a reference.
In most cases the separate detectors should line up quite well, however
there are some indications that especially the LW1 detector does not
line up well in case a faint source is observed. In that case the
LW1 detector should not be used as a reference. In a future issue of
this document we will try to give more definite guidelines for the
fitting together of subspectra.
N.Trams, ISO Science Operations Team
Using inputs from:
C.Gry, T. Lim, LWS Instrument Dedicated Team
A.Harwood, P.E.Clegg, B.Swinyard, K.King, LWS Instrument Team
S.Lord, S.Unger, IPAC.