The SWS Fabry-Pérot section may be used at wavelengths between 11.4
and 44.5 
m. Instrument levels tests have shown that performance in
the extended wavelength range outside the nominal design wavelength
range of 15-35 m is good enough to make the extended range generally
available.
A few remaining peculiarities of the
extended range are discussed together with the following performance
description. Results throughout this section refer to use of the
Fabry-Pérot AOT bands of Tab. 2.1
that have been selected to give the best
tradeoff between the various design goals (high sensitivity, low leakage
etc.).