The determination of the LWS beam sizes has recently been revised by C. Lloyd, of the LWS Instrument Team at RAL, using a fully sampled raster map of Mars. We encourage you to download the PostScript file with Lloyd's full report explaining in detail the procedure followed.
In the Table below we summarize his results. The figure reported for
each detector is the radius R in arcsec of the equivalent
cylinder which contains 100% of the intrinsic source flux:
The possibility to convert from flux into flux/sr using the above values, will be available with release 2.0 of ISAP.