A program is currently underway to widen the empirical database, and to implement improved reference data for the calibration sources used.
First results confirm the discrepancies found in the preliminary report.
As long as this program is not completed, users should be aware of the mentioned uncertainties which may be important in special cases, e.g. for deconvolution or for attempts to infer source sizes from line widths. SWS observers can help this calibration program by pointing out suitable observations in the ISO archive, beyond those known to the SWS instrument team. We are currently using planetary nebulae, some PDRs, and planets, but a wider observational basis is important to eliminate the effects of uncertain knowledge of the properties of individual sources. All we need is a pointer to suitable observations which should meet the criteria described below, and for which the listed information should be available. Any observation which has lines clearly discernible in the dot cloud of the unprocessed AAR is ok, even if it still needs e.g. flatfielding to get a good profile - The intrinsic linewidth is small.