- All four spectrograph modules and the IRS peak-up arrays are
performing well. All IRS arrays are more sensitive than pre-launch
estimates.
- Slit and peak-up field-of-view dimensions, as well as wavelength
ranges that can be calibrated for each (sub-)slit, have been
changed slightly to reflect in-orbit measurements.
- The pointing accuracy of Spitzer is very good. Low accuracy
IRS peak-ups may not be necessary if target coordinates are
well known, or if peak-up images are not required.