The IUE cameras have been shown to exhibit a degradation in sensitivity with time. Depending on what camera was used there are several options available for correcting the fluxes. These are for low dispersion data only. References for each correction will be listed at the end of this section.
For LWR data, two choices are available. First, there is a correction done within IUESPEC. IUESPEC will ask you whether you wish to correct for sensitivity degradation. It will tell you NOT to perform this correction if you plan to run RBSENSCOR (the second choice). RBSENSCOR can correct both LWR and SWP data, but the correction done by IUESPEC is only for LWR data. The sensitivity degradation correction performed by RBSENSCOR is the only one available for SWP data. DCCOR should be run prior to RBSENSCOR.
The ``aptype'' parameter will be a code number for aperture type:
1 for trailed data
2 for small aperture data
3 for large aperture point source data
If not given, RBSENSCOR will attempt to determine the aperture type. If unsuccessful, you will be prompted for it.
If you have LWP data, you may use LWPCORFLUX to correct for sensitivity degradation in that camera:
LWPCORFLUX,H,W,F,Q,FCORR,/nopatch
This procedure is for post-1984.5 low dispersion large aperture LWP data only. Corrections are not considered reliable outside the range 2000-3200 Å.