Table 1 gives a comparison between the pre-flight and
in-flight sensitivity limits. The in-flight values were derived from
dedicated observations. All sensitivity limits refer to S/N=1, 256 sec
on-source integration time, 1 reference background position at 1 aperture
distance. Column 1 lists the detector used. Column 2 lists the most
sensitive filters that are also frequently used for calibration purposes.
Column 3 lists the apertures which are frequently used for calibrations;
in case of an array the pixel size of the array is given. Columns 4
and 5 list the 1
sensitivities. The ``background'' (column 6)
gives the typical sky background considered in the calculation. The last
column lists the main source of noise causing the limit.
For the quoted in-flight sensitivities conservative numbers were chosen. Under good observing conditions with a minimum of glitches due to space weather activity and with an appropriate data reduction better values can be achieved.
